{{TDiHBottom}}
----
January 1
:[[2001]] - [[Tokyo You Turn]] releases.
:[[2002]] - [[First Kiss]] releases.
:[[2004]] - [[Sarasara no Kawa]] releases.
:[[2004]] - [[×3]] releases.
:[[2007]] - [[Kimi wo Sagashiteru]] releases.
:[[2008]] - [[Nijiiro Button]] releases.{{TDiHBottom}}
----
January 2
:[[2007]] - [[Kagetsu Yoru]] releases.
:[[2011]] - [[Fukumura Mizuki]], [[Ikuta Erina]], [[Sayashi Riho]], and [[Suzuki Kanon]] join [[Morning Musume]] as 9th generation members.{{TDiHBottom}}
----
January 3
:[[2007]] - [[Fuyu no Ashioto]] releases.{{TDiHBottom}}
----
January 6
:[[2010]] - [[SHOCK!]] releases.{{TDiHBottom}}
----
January 7
:[[2000]] - [[Ishiguro Aya]] graduates [[Morning Musume]] and Hello! Project.
:[[2003]] - [[Fujimoto Miki]] joins [[Morning Musume]] as a 6th generation member.{{TDiHBottom}}
----
January 9
:[[2005]] - [[Ran・RUN・Ran]] releases.
:[[2009]] - [[1st Saikou!]] releases.{{TDiHBottom}}
----
January 12
:[[2011]] - [[Gloria]] releases.{{TDiHBottom}}
----
January 14
:[[2004]] - [[Berryz Koubou]] is formed.
:[[2009]] - [[Berryz Koubou Special Best Vol.1]] releases.{{TDiHBottom}}
----
January 16
:[[2008]] - [[16sai no Koi Nante]] releases.{{TDiHBottom}}
----
January 17
:[[2001]] - [[Minimoni Jankenpyon! / Haru Natsu Aki Fuyu Daisukki!]] releases.{{TDiHBottom}}
----
January 18
:[[2012]] - [[Hatsukoi Cider / DEEP MIND]] releases.{{TDiHBottom}}
----
January 19
:[[2003]] - [[Kamei Eri]], [[Michishige Sayumi]], and [[Tanaka Reina]] join [[Morning Musume]] as 6th generation members.
:[[2005]] - [[THE Manpower!!!]] releases.{{TDiHBottom}}
----
January 20
:[[2010]] - [[Going On!]] releases.{{TDiHBottom}}
----
January 21
:[[2004]] - [[Ai Araba IT'S ALL RIGHT]] releases.
:[[2009]] - [[co・no・mi・chi]] releases.
:[[2009]] - [[Omoi Afurete]] releases.{{TDiHBottom}}
----
January 22
:[[2014]] - [[Morimusu]] is formed.{{TDiHBottom}}
----
January 23
:[[2013]] - [[Help me!!]] releases.{{TDiHBottom}}
----
January 24
:[[2007]] - [[Bokura ga Ikiru MY ASIA]] releases.{{TDiHBottom}}
----
January 25
:[[2006]] - [[Ima ni Kitto... In My LIFE]] releases.
:[[2012]] - [[Pyocopyoco Ultra]] releases.{{TDiHBottom}}
----
January 26
:[[1998]] - The [[Morning Musume]] and [[Heike Michiyo]] fanclub [[Hello! Project|Hello!]] is created.
:[[2000]] - [[Koi no Dance Site]] releases.
:[[2011]] - [[Seishun no Serenade]] releases.{{TDiHBottom}}
----
January 27
:[[2007]] - [[Kimura Asami]] and [[Saito Miuna]] graduated from [[Country Musume]] and Hello! Project.
:[[2011]] - [[Koi wo Shichaimashita!]] releases.{{TDiHBottom}}
----
January 28
:[[1998]] - [[Morning Coffee]] releases.
:[[2004]] - [[2 Paint It Gold]] releases.
:[[2004]] - [[Kiseki no Kaori Dance.]] releases.
:[[2009]] - [[4 Akogare My STAR]] releases.
:[[2011]] - [[Dream Morning Musume]] is formed.{{TDiHBottom}}
----
January 29
:[[2003]] - [[T・W・O]] releases.
:[[2003]] - [[Akai Freesia]] releases.
:[[2014]] - [[Egao no Kimi wa Taiyou sa / Kimi no Kawari wa Iyashinai / What is LOVE?]] releases.{{TDiHBottom}}
----
January 30
:[[2002]] - [[Minimoni Hinamatsuri! / Mini Strawberry~ Pie]] releases.
:[[2005]] - [[Iida Kaori]] graduates from [[Morning Musume]].
:[[2013]] - [[Berryz Mansion 9 Kai]] releases.{{TDiHBottom}}
----
January 31
:[[2001]] - [[Best! Morning Musume 1]] releases.{{TDiHBottom}}
----
February 1
:[[2006]] - [[Suna wo Kamu You ni... NAMIDA]] releases.
:[[2012]] - [[Choto Mate Kudasai!]] releases.{{TDiHBottom}}
----
February 2
:[[2011]] - [[Zassou no Uta]] releases.{{TDiHBottom}}
----
February 3
:[[2010]] - [[Our Songs]] releases.
:[[2013]] - [[Juice=Juice]] is formed.
:2013 - [[Miyazaki Yuka]] joins Hello! Project.{{TDiHBottom}}
----
February 4
:[[2004]] - [[Hitoribocchi]] releases.
:[[2004]] - [[Aegekai ni Dakarete]] releases.
:[[2009]] - [[Hapi☆Hapi Sunday!]] releases.{{TDiHBottom}}
----
February 5
:[[2003]] - [[Boogie Train '03]] releases.
:[[2003]] - [[Makking GOLD 1]] releases.{{TDiHBottom}}
----
February 6
:[[2002]] - [[♡Momoiro Kataomoi♡]] releases.
:[[2008]] - [[Ren'ai♥Rider]] releases.
:[[2008]] - [[1st GOODSAL]] releases.
:[[2013]] - [[Kono Machi]] releases.
:[[2013]] - [[BEST FRIENDS]] releases.{{TDiHBottom}}
----
February 7
:[[2001]] - [[Kekkyoku Bye Bye Bye]] releases.{{TDiHBottom}}
----
February 8
:[[2012]] - [[Dainana Shou "Utsukushikutte Gomen ne"]] releases.{{TDiHBottom}}
----
February 9
:[[2005]] - [[Nikutai wa Shoujiki na EROS]] releases.
:[[2005]] - [[Koi no Fuga]] releases.
:[[2011]] - [[Short Cut]] releases.{{TDiHBottom}}
----
February 10
:[[1999]] - [[Anata no Yume ni Naritai]] releases.
:[[1999]] - [[Memory Seishun no Hikari]] releases.
:[[2010]] - [[We are Buono!]] releases.
:[[2010]] - [[Onna ga Medatte Naze Ikenai]] releases.{{TDiHBottom}}
----
February 11
:[[2004]] - [[Minimoni Songs 2]] releases.
:[[2004]] - [[Genki no Nai Hi no Komoriuta / Nagaragawa no Hare]] releases.
:[[2009]] - [[Buono!2]] releases.
:[[2009]] - [[Chocolate Damashii]] releases.{{TDiHBottom}}
----
February 14
:[[2002]] - [[Saa! Koibito ni Narou]] releases.
:[[2007]] - [[Egao YES Nude]] releases.
:[[2008]] - [[Seishun! LOVE Lunch]] releases.{{TDiHBottom}}
----
February 15
:[[1998]] - [[Sotsugyou ~TOP OF THE WORLD~]] releases.
:[[2001]] - [[Kuyashi Namida Porori]] releases.
:[[2006]] - [[Rainbow 7]] releases.
:[[2012]] - [[Shining Butterfly]] releases.{{TDiHBottom}}
----
February 17
:[[2010]] - [[MELON'S NOT DEAD]] releases.{{TDiHBottom}}
----
February 18
:[[2009]] - [[Naichau Kamo]] releases.{{TDiHBottom}}
----
February 19
:[[2000]] - [[Amai Anata no Aji]] releases.
:[[2003]] - [[Morning Musume no Hyokkori Hyoutanjima]] releases.
:[[2014]] - [[Otona na no yo! / 1-Oku 3-Zenman Sou Diet Oukoku]] releases.{{TDiHBottom}}
----
February 20
:[[2002]] - [[Souda! We're ALIVE]] releases.
:[[2008]] - [[Café Buono!]] releases.{{TDiHBottom}}
----
February 21
:[[1999]] - [[Taiyou to Ciscomoon]] is formed.
:[[2001]] - [[Koi wo Shichaimashita!]] releases.
:[[2002]] - [[Tokyo, Yoimachigusa.]] releases.
:[[2007]] - [[Sakura Chirari]] releases.{{TDiHBottom}}
----
February 22
:[[2012]] - [[Ai no Album 8]] releases.
:[[2012]] - [[Doki Doki Baby / Tasogare Kousaten]] releases.{{TDiHBottom}}
----
February 23
:[[2005]] - [[3rd Station]] releases.
:[[2005]] - [[Zutto Suki de Ii desu ka]] releases.
:[[2011]] - [[Kiss me Aishiteru]] releases.
:[[2013]] - [[Mano Erina]] graduates from Hello! Project.{{TDiHBottom}}
----
February 24
:[[2010]] - [[Shocking 5]] releases.
:[[2010]] - [[Haru no Arashi]] releases.{{TDiHBottom}}
----
February 25
:[[2004]] - [[Yuujou ~Kokoro no Busu ni wa Naranee!~]] releases.
:[[2004]] - [[Sakura Mankai]] releases.
:[[2009]] - [[Kenchana ~Daijoubu~]] releases.
:[[2009]] - [[Shugo Shugo!]] releases.{{TDiHBottom}}
----
February 26
:[[2003]] - [[MIKI 1]] releases.
:[[2014]] - [[Berryz Koubou Special Best Vol.2]] releases.{{TDiHBottom}}
----
February 27
:[[2008]] - [[LALALA Shiawase no Uta]] releases.
:[[2013]] - [[Cabbage Hakusho ~Haru Hen~]] releases.{{TDiHBottom}}
----
February 28
:[[2001]] - [[BABY! Koi ni KNOCK OUT!]] releases.
:[[2005]] - [[Koimizuki]] releases.
:[[2007]] - [[☆☆☆(Mitsuboshi)]] releases.{{TDiHBottom}}
----
March 1
:[[2009]] - [[Da Xiao Jie]] is formed.
----
March 2
:[[2005]] - [[Kacchoii ze! JAPAN]] releases.
:[[2005]] - [[2nd W]] releases.
:[[2011]] - [[Heroine ni Narou ka!]] releases.
:2011 - [[Hello Cover Series|LOVE Namida Iro]] (Takahashi Ai) releases.
:[[2013]] - [[Plumeria]], [[Mellowquad]], and [[Dia Lady]] are formed{{TDiHBottom}}
----
March 3
:[[2004]] - [[Anata Nashi de wa Ikite Yukenai]] releases.
:[[2004]] - [[JECICA]] releases.
:[[2010]] - [[Otakebi Boy WAO! / Tomodachi wa Tomodachi Nanda!]] releases.
:[[2011]] - [[Up Up Girls (Kari)|Up Front Girls]] is formed.{{TDiHBottom}}
----
March 6
:[[2010]] - [[READY! KICK OFF!!]] releases.{{TDiHBottom}}
----
March 7
:[[2001]] - [[Denwa Matteimasu]] releases.
:[[2007]] - [[VERY BEAUTY]] releases.{{TDiHBottom}}
----
March 8
:[[2000]] - [[Akai Nikkichou]] releases.
:[[2000]] - [[Aoi Sports Car no Otoko]] releases.
:[[2000]] - [[Kiiroi Osora de BOOM BOOM BOOM]] releases.{{TDiHBottom}}
----
March 10
:[[1999]] - [[Motto]] releases.
:[[2004]] - [[Hyacinth]] releases.{{TDiHBottom}}
----
March 11
:[[2009]] - [[Dakishimete Dakishimete]] releases.
:[[2009]] - [[Best☆Kirari]] releases.{{TDiHBottom}}
----
March 12
:[[2003]] - [[Ne~e?]] releases.
:[[2003]] - [[1st Anniversary]] releases.
:[[2008]] - [[3rd ~LOVE Escalation!~]] releases.
:[[2008]] - [[Dschinghis Khan]] releases.{{TDiHBottom}}
----
March 13
:[[2002]] - [[Aenai Nagai Nichiyoubi]] releases.
:[[2013]] - [[Asian Celebration]] releases.
:[[2014]] - [[Sato no Akari]], [[Triplet]] and [[ODATOMO]] are formed under the [[SATOYAMA movement]].{{TDiHBottom}}
----
March 14
:[[2007]] - [[25 ~Vingt-Cinq~]] releases.
:[[2010]] - [[Otona ni Narutte Muzukashii!!!]] releases.{{TDiHBottom}}
----
March 15
:[[2006]] - [[SEXY BOY ~Soyokaze ni Yorisotte~]] releases.{{TDiHBottom}}
----
March 17
:[[2004]] - [[Sayonara no LOVE SONG]] releases.
:[[2010]] - [[10 MY ME]] releases.{{TDiHBottom}}
----
March 18
:[[2009]] - [[Otome no Inori]] releases.
:[[2009]] - [[Platinum 9 DISC]] releases.{{TDiHBottom}}
----
March 19
:[[2003]] - [[Uwasa no SEXY GUY]] releases.
:[[2003]] - [[Kotoshima]] releases.
:[[2008]] - [[Charisma・Kirei]] releases.{{TDiHBottom}}
----
March 20
:[[2008]] - [[Koero! Rakuten Eagles]] releases.
:[[2013]] - [[Tabidachi no Haru ga Kita]] releases.{{TDiHBottom}}
----
March 21
:[[2007]] - [[LU LU LU]] releases.
:[[2007]] - [[SEXY 8 BEAT]] releases.
:[[2012]] - [[Be Genki (Naseba Naru!)]] releases.{{TDiHBottom}}
----
March 24
:[[2005]] - [[Matsuura Aya Best 1]] releases.
:[[2007]] - [[Daisuki Rakuten Eagles]] releases.{{TDiHBottom}}
----
March 25
:[[1998]] - [[Teenage Dream]] releases.
:[[2006]] - [[LET'S GO Rakuten Eagles]] releases.{{TDiHBottom}}
----
March 26
:[[2003]] - [[No.5]] releases.{{TDiHBottom}}
----
March 27
:[[2002]] - [[4th "Ikimasshoi!"]] releases.{{TDiHBottom}}
----
March 28
:[[2001]] - [[Ai no Bakayarou]] releases.
:[[2007]] - [[Unforgettable]] releases.
:[[2012]] - [[More Friends Over]] releases.{{TDiHBottom}}
----
March 29
:[[2000]] - [[3rd -LOVE Paradise-]] releases.
:[[2003]] - [[Minimoni]] shifts: [[Yaguchi Mari]] graduates, [[Mika Todd]] becomes the new leader, [[Takahashi Ai]] becomes the new fourth member.
:[[2006]] - [[2nd ~Shimiwataru Omoi~]] releases.
:2006 - [[Jiriri Kiteru]] releases.{{TDiHBottom}}
----
March 30
:[[2005]] - [[Special Generation]] releases.
:[[2011]] - [[7 Berryz Times]] releases.
:2011 - [[Futari Osaka]] releases.
:2011 - [[Hello Cover Series|Akai Nikkichou, dearest, and Furusato]] (Takahashi Ai) release.{{TDiHBottom}}
----
March 31
:[[1999]] - [[TANPOPO 1]] releases.
:[[2004]] - [[Best! Morning Musume 2]] releases.
:[[2009]] - [[Elder Club]] graduates from Hello! Project.
:[[2010]] - [[6th Otakebi Album]] releases.{{TDiHBottom}}
----
April 1
:[[1999]] - Hello! becomes [[Hello! Project]].{{TDiHBottom}}
----
April 2
:[[2000]] - [[Naki Usagi]] releases.{{TDiHBottom}}
----
April 3
:[[2013]] - [[Crazy Kanzen na Otona]] releases.
:[[2013]] - [[Tokainaka no Kare]] releases.
:[[2013]] - [[Watashi ga Iu Mae ni Dakishimenakya ne]] releases.{{TDiHBottom}}
----
April 4
:[[2009]] -[[S/mileage]] is formed.{{TDiHBottom}}
----
April 6
:[[2011]] - [[Chou WONDERFUL! 6]] releases.
:[[2011]] - [[Maji Desu ka Ska!]] releases.{{TDiHBottom}}
----
April 7
:[[2010]] - [[Mianeyo ~Gomennasai~]] releases.{{TDiHBottom}}
----
April 9
:[[2003]] - [[Rock n' Roll Kenchoushozaichi ~Oboechaina Series!~]] releases.{{TDiHBottom}}
----
April 11
:[[2001]] - [[Dokki Doki! LOVE Mail]] releases.
:[[2007]] - [[Secret]] releases.
:[[2012]] - [[Ren'ai Hunter]] releases.{{TDiHBottom}}
----
April 12
:[[2000]] - [[Maeda Yuki]] joins Hello! Project.
:[[2006]] - [[Sweetoholic]] releases.{{TDiHBottom}}
----
April 13
:[[2001]] - [[Tetteiteki Unmei]] releases.{{TDiHBottom}}
----
April 15
:[[2009]] - [[Bye Bye Bye!]] releases.{{TDiHBottom}}
----
April 16
:[[2000]] - [[Ishikawa Rika]], [[Yoshizawa Hitomi]], [[Tsuji Nozomi]], and [[Kago Ai]] join [[Morning Musume]] as the 4th generation.
:[[2008]] - [[Resonant Blue]] releases.{{TDiHBottom}}
----
April 17
:[[2002]] - [[Iroppoi Onna ~SEXY BABY~]] releases.
:[[2005]] - [[Yaguchi Mari]] resigns from [[Morning Musume]].
:[[2011]] - [[SI☆NA]] disbands.
:[[2013]] - [[Brainstorming / Kimi Sae Ireba Nani mo Iranai]] releases.{{TDiHBottom}}
----
April 18
:[[1999]] - [[Fukuda Asuka]] graduates [[Morning Musume]] and Hello! Project.
:[[2001]] - [[Hajimete no Happy Birthday!]] releases.
:[[2001]] - [[Yume Miru Chikara]] releases.
:[[2007]] - [[2 Mini ~Ikiru to Iu Chikara~]] releases.
:[[2012]] - [[Kimi wa Jitensha Watashi wa Densha de Kitaku]] releases.{{TDiHBottom}}
----
April 19
:[[2000]] - [[DON'T STOP Ren'aichuu]] releases.{{TDiHBottom}}
----
April 20
:[[2005]] - [[Yume Naraba]] releases.
:[[2011]] - [[Dreams. 1]] releases.
:[[2011]] - [[Koi ni Booing Buu!]] releases.{{TDiHBottom}}
----
April 21
:[[1999]] - [[Tsuki to Taiyou]] releases.
:[[2004]] - [[Lucky Cha Cha Cha!]] releases.
:[[2010]] - [[URA MELON]] releases.{{TDiHBottom}}
----
April 23
:[[2003]] - [[Os Avrio ~Ai wa Matte Kurenai~]] releases.
:[[2003]] - [[AS FOR ONE DAY]] releases.
:[[2008]] - [[Namida no Iro]] releases.
:[[2008]] - [[Okitegami]] releases.
:[[2008]] - [[Nanni mo Iwazu ni I LOVE YOU]] releases.
:[[2013]] - [[Slow Love]] releases.{{TDiHBottom}}
----
April 24
:[[2002]] - [[Jinsei ga Mou Hajimatteru]] releases.
:[[2002]] - [[Ai~n Taisou / Ai~n! Dance no Uta]] releases.{{TDiHBottom}}
----
April 25
:[[2004]] - [[Abe Natsumi]] graduates from [[Morning Musume]].
:[[2007]] - [[Kanashimi Twilight]] releases.
:[[2012]] - [[Akane]] releases.{{TDiHBottom}}
----
April 27
:[[1999]] - [[Country Musume]] is formed.
:[[2000]] - [[Hokkaido Shalala]] releases.
:[[2005]] - [[Osaka Koi no Uta]] releases.{{TDiHBottom}}
----
April 28
:[[2004]] - [[Fighting Pose wa Date ja nai!]] releases.
:[[2010]] - [[Campus Life ~Umarete Kite Yokatta~]] releases.
:[[2012]] - [[Chou HAPPY SONG]] releases.{{TDiHBottom}}
----
April 29
:[[2009]] - [[MY BOY]] releases.{{TDiHBottom}}
----
April 30
:[[2008]] - [[Anataboshi]] releases.{{TDiHBottom}}
----
May 1
:[[2003]] - [[Haha to Musume no Duet Song]] releases.
:2003 - [[Zutto Zutto]] releases.
:[[2005]] - [[Kusumi Koharu]] joins Morning Musume as the 7th generation.{{TDiHBottom}}
----
May 2
:[[2007]] - [[Happy☆彡]] releases.
:[[2012]] - [[Dot Bikini]] releases.{{TDiHBottom}}
----
May 3
:[[1997]] - [[Yasuda Kei]], [[Yaguchi Mari]], and [[Ichii Sayaka]] join [[Morning Musume]] as 2nd generation members.
:[[2004]] - [[Mika Todd]] graduates from [[Coconuts Musume]] and Hello! Project.
:2004 - [[Minimoni]] disbands.
:[[2010]] - [[Melon Kinenbi]] disbands.{{TDiHBottom}}
----
May 4
:[[2011]] - [[LOVE]] releases.{{TDiHBottom}}
----
May 5
:[[2013]] - [[Samidare Bijo ga Samidareru]] releases.{{TDiHBottom}}
----
May 6
:[[2006]] - [[Massara Blue Jeans]] releases.
:[[2007]] - [[Yoshizawa Hitomi]] graduates from [[Morning Musume]]. [[Junjun]] and [[Linlin]] join as 8th generation members.
{{TDiHBottom}}
----
May 7
:[[2003]] - [[Yasuda Kei]] graduates from [[Morning Musume]].
:[[2005]] - [[Ishikawa Rika]] graduates from [[Morning Musume]].{{TDiHBottom}}
----
May 8
:[[2003]] - [[Chance of LOVE]] releases.{{TDiHBottom}}
----
May 9
:[[2002]] - [[Te wo Nigitte Arukitai]] releases.
:[[2007]] - [[Too far away ~Onna no Kokoro~]] releases.
:[[2012]] - [[HAPPY! Ippuku Maru]] releases.{{TDiHBottom}}
----
May 10
:[[2006]] - [[Issai Gassai Anata ni∮A.ge.ru♪]] releases.{{TDiHBottom}}
----
May 12
:[[1999]] - [[Manatsu no Kousen]] releases.
:[[2004]] - [[Roman ~MY DEAR BOY~]] releases.
:[[2010]] - [[Onegai Dakara...]] releases.{{TDiHBottom}}
----
May 13
:[[2009]] - [[Shouganai Yume Oibito]] releases.{{TDiHBottom}}
----
May 14
:[[2003]] - [[Minimoni Kazoe Uta ~Ofuro Version~ / Minimoni Kazoe Uta ~Date Version~]] releases.
:[[2008]] - [[Kiss! Kiss! Kiss!]] releases.{{TDiHBottom}}
----
May 16
:[[2007]] - [[Koko ni Iruzee! (Tsuji Nozomi)]] releases.{{TDiHBottom}}
----
May 17
:[[2000]] - [[Tokonatsu Musume]] releases.
:[[2000]] - [[One Room Natsu no Koi Monogatari]] releases.
:[[2000]] - [[Happy Summer Wedding]] releases.{{TDiHBottom}}
----
May 18
:[[2005]] - [[Ai no Imi wo Oshiete!]] releases.{{TDiHBottom}}
----
May 19
:[[2004]] - [[Koi no Vacance]] releases.{{TDiHBottom}}
----
May 20
:[[2009]] - [[Hajimete no Keiken]] releases.{{TDiHBottom}}
----
May 21
:[[2000]] - [[Ichii Sayaka]] graduates [[Morning Musume]] and Hello! Project.
:[[2003]] - [[GET ALONG WITH YOU]] releases.
:[[2008]] - [[Kizuna]] releases.
:[[2013]] - [[Tanaka Reina]] graduates from [[Morning Musume]] and Hello! Project.
:2013 - [[Fukumura Mizuki]] and [[Iikubo Haruna]] appointed sub-leaders of [[Morning Musume]].{{TDiHBottom}}
----
May 22
:[[2013]] - [[2 Smile Sensation]] releases.{{TDiHBottom}}
----
May 23
:[[2007]] - [[1st GAM ~Amai Yuuwaku~]] releases.
:[[2007]] - [[Koisuru♡Angel♡Heart]] releases.{{TDiHBottom}}
----
May 25
:[[2005]] - [[Ajisai Ai Ai Monogatari]] releases.
:[[2011]] - [[Momoiro Sparkling]] releases.
:[[2011]] - [[Busan Hatsu]] releases.{{TDiHBottom}}
----
May 26
:[[2004]] - [[Piriri to Yukou!]] releases.
:[[2004]] - [[DO MY BEST]] releases.
:[[2010]] - [[Yume Miru Fifteen]] releases.{{TDiHBottom}}
----
May 27
:[[1998]] - [[Summer Night Town]] releases.
:[[2009]] - [[Omakase♪Guardian]] releases.{{TDiHBottom}}
----
May 29
:[[2002]] - [[Yeah! Meccha Holiday]] releases.{{TDiHBottom}}
----
May 30
:[[2012]] - [[S/mileage Best Album Kanzenban 1]] releases.{{TDiHBottom}}
----
May 31
:[[2000]] - [[Anata no Shirt to Love song]] releases.{{TDiHBottom}}
----
June 1
:[[2007]] - [[Fujimoto Miki]] resigns from [[Morning Musume]].{{TDiHBottom}}
----
June 2
:[[2004]] - [[Datte Ikitekanakucha]] releases.
:[[2004]] - [[Duo U&U]] releases.{{TDiHBottom}}
----
June 3
:[[2006]] - [[Soku Dakishimete]] releases.
:[[2009]] - [[Seishun Bus Guide / Rival]] releases.{{TDiHBottom}}
----
June 4
:[[2000]] - [[Ishikawa Rika]] and [[Kago Ai]] join [[Tanpopo]].
:[[2003]] - [[GOOD BYE Natsuo]] releases.{{TDiHBottom}}
----
June 5
:[[2002]] - [[Murasaki Shikibu]] releases.{{TDiHBottom}}
----
June 6
:[[2009]] - [[aMa no Jaku]] releases.{{TDiHBottom}}
----
June 7
:[[2006]] - [[Glass no Pumps]] releases.{{TDiHBottom}}
----
June 8
:[[2005]] - [[Nanchuu Koi wo Yatteruu YOU KNOW?]] releases.
:[[2011]] - [[Ai no Dangan]] releases.{{TDiHBottom}}
----
June 9
:[[1999]] - [[Junjou Koushinkyoku]] releases.
:[[2004]] - [[Namida no Taiyou]] releases.
:[[2010]] - [[Seishun Collection]] releases.{{TDiHBottom}}
----
June 10
:[[2006]] - [[Onegai Miwaku no Target / Crazy Happy!]] releases.{{TDiHBottom}}
----
June 11
:[[2005]] - [[℃-ute]] is formed.
:[[2008]] - [[C\C (CinderellaComplex)]] releases.{{TDiHBottom}}
----
June 12
:[[2002]] - [[Sotto Kuchizukete Gyutto Dakishimete]] releases.
:[[2013]] - [[Ten Made Nobore!]] releases.{{TDiHBottom}}
----
June 13
:[[2001]] - [[Tropica~l Koishite~ru]] releases.{{TDiHBottom}}
----
June 15
:[[2011]] - [[Only you]] releases.{{TDiHBottom}}
----
June 16
:[[1999]] - [[Tanpopo (Single Version)]] releases.
:[[2010]] - [[Little♡Princess☆Pri!]] releases.{{TDiHBottom}}
----
June 18
:[[2003]] - [[Scramble]] releases.
:[[2007]] - [[Konno Asami]] rejoins Hello! Project.
{{TDiHBottom}}
----
June 19
:[[2002]] - [[Natsu no Yoru wa Danger!]] releases.
:[[2013]] - [[Golden Chinatown / Sayonara Usotsuki no Watashi]] releases.{{TDiHBottom}}
----
June 21
:[[2006]] - [[Ambitious! Yashinteki de Ii jan]] releases.
:[[2009]] - [[Jang Da Yeon]] joins Hello! Project Korea.{{TDiHBottom}}
----
June 22
:[[2005]] - [[Onna, Kanashii, Otona / Inshouha Renoir no You ni / Hitoshirezu Mune wo Kanaderu Yoru no Aki]] releases.{{TDiHBottom}}
----
June 23
:[[1999]] - [[Gatamekira]] releases.{{TDiHBottom}}
----
June 24
:[[2009]] - [[DON'T SAY GOOD-BYE]] releases.{{TDiHBottom}}
----
June 25
:[[2008]] - [[TOKYO FRIEND☆SHIPS]] releases.{{TDiHBottom}}
----
June 26
:[[2000]] - [[Yoshizawa Hitomi]] joins [[Petitmoni]].
:[[2002]] - [[Minimoni Song Daihyakka 1 Kan]] releases.{{TDiHBottom}}
----
June 27
:[[2001]] - [[Zentaiteki ni Daisuki Desu.]] releases.
:[[2007]] - [[Kokuhaku no Funsui Hiroba]] releases.
:[[2012]] - [[Song for the DATE]] releases.{{TDiHBottom}}
----
June 28
:[[2000]] - [[Kokuhaku Kinenbi]] releases.
:[[2006]] - [[The Stress]] releases.{{TDiHBottom}}
----
June 29
:[[2008]] - [[Manopiano]] releases.
:[[2011]] - [[My Days for You]] releases.{{TDiHBottom}}
----
July 1
:[[1998]] - [[Daikirai]] releases.
:[[2009]] - [[Shochuu Omimai Moushiagemasu]] releases.{{TDiHBottom}}
----
July 2
:[[2006]] - [[Yume Kara Samete]] releases.{{TDiHBottom}}
----
July 3
:[[2002]] - [[Shiawase Beam! Suki Suki Beam!]] releases.
:[[2002]] - [[Shiawase Kyouryuu Ondo]] releases.
:[[2002]] - [[Shiawase Desu ka?]] releases.
:[[2013]] - [[Atarashii Watashi ni Nare! / Yattaruchan]] releases.{{TDiHBottom}}
----
July 4
:[[2001]] - [[Dancing! Natsu Matsuri]] releases.
:[[2001]] - [[Chu! Natsu Party]] releases.
:[[2001]] - [[Summer Reggae! Rainbow]] releases.
:[[2012]] - [[One•Two•Three / The Matenrou Show]] releases.{{TDiHBottom}}
----
July 5
:[[2000]] - [[Otome Pasta ni Kandou]] releases.
:[[2006]] - [[3 Natsu Natsu Mini Berryz]] releases.
:[[2013]] - [[Otsuka Aina]] withdraws from [[Juice=Juice]] and [[Hello Pro Kenshuusei]].{{TDiHBottom}}
----
July 6
:[[2005]] - [[Suppin to Namida.]] releases.{{TDiHBottom}}
----
July 7
:[[2004]] - [[1st Chou Berryz]] releases.
:[[2004]] - [[Yokohama Shinkirou]] releases.{{TDiHBottom}}
----
July 8
:[[1998]] - [[First Time]] releases.{{TDiHBottom}}
----
July 9
:[[2003]] - [[Kowarenai Ai ga Hoshii no / GET UP! Rapper / BE ALL RIGHT!]] releases.
:[[2006]] - [[Ooki na Ai de Motenashite]] releases.
:[[2008]] - [[Yuke Yuke Monkey Dance]] releases.{{TDiHBottom}}
----
July 10
:[[2013]] - [[Kanashiki Amefuri / Adam to Eve no Dilemma]] releases.{{TDiHBottom}}
----
July 11
:[[2000]] - [[Sheki-Dol]] is formed.
:[[2007]] - [[Meguru Koi no Kisetsu]] releases.
:[[2009]] - [[Arihara Kanna]] leaves [[℃-ute]] and Hello! Project.{{TDiHBottom}}
----
July 12
:[[2000]] - [[Shanghai no Kaze]] releases.
:[[2006]] - [[Koi☆Kana]] releases.{{TDiHBottom}}
----
July 14
:[[1999]] - [[Furusato]] releases.
:[[2004]] - [[YOUR SONG ~Seishun Sensei~]] releases.
:[[2010]] - [[Maji Bomber!!]] releases.{{TDiHBottom}}
----
July 16
:[[1999]] - [[Yanagihara Hiromi]] dies in a car accident.
:[[2003]] - [[Tokyo Kirigirisu]] releases.
:[[2008]] - [[Papancake]] releases.{{TDiHBottom}}
----
July 17
:[[2002]] - [[Shitsuren LOVE Song]] releases.{{TDiHBottom}}
----
July 19
:[[2000]] - [[HEY! Mahiru no Shinkirou]] releases.{{TDiHBottom}}
----
July 20
:[[2011]] - [[Natsu Dakara!]] releases.
:[[2012]] - [[DIY♡]] and [[Peaberry]] are formed.{{TDiHBottom}}
----
July 21
:[[2007]] - [[Buono!]] is formed.{{TDiHBottom}}
----
July 22
:[[2004]] - [[Joshi Kashimashi Monogatari]] releases.
:[[2004]] - [[Dai Nishou ~Tsuyogari~]] releases.
:[[2009]] - [[Pinchi wa Chance - Baka ni Narou ze!]] releases.{{TDiHBottom}}
----
July 23
:[[1999]] - [[Halation Summer]] releases.
:1999 - [[Futari no Hokkaido]] releases.
:[[2006]] - [[Konno Asami]] and [[Ogawa Makoto]] graduate from Morning Musume.{{TDiHBottom}}
----
July 24
:[[2002]] - [[Do it! Now]] releases.
:[[2003]] - [[Uwaki na Honey Pie]] releases.{{TDiHBottom}}
----
July 25
:[[2001]] - [[The☆Peace!]] releases.
:[[2006]] - [[Fantasia]] releases.
:[[2007]] - [[Onna ni Sachi Are]] releases.
:[[2009]] - [[Nakayama Nana]] leaves Hello! Project Kansai.
:[[2012]] - [[cha cha SING]] releases.
:2012 - [[Cat's♥Eye 7]] is formed.{{TDiHBottom}}
----
July 26
:[[2000]] - [[Watashi mo "I LOVE YOU"]] releases.
:[[2000]] - [[Seishun Jidai 1.2.3! / Bicycle Daiseikou!]] releases.
:[[2006]] - [[Omae no Namida wo Ore ni Kure]] releases.{{TDiHBottom}}
----
July 27
:[[2005]] - [[Iroppoi Jirettai]] releases.{{TDiHBottom}}
----
July 28
:[[1999]] - [[scene]] releases.
:[[1999]] - [[Second Morning]] releases.
:[[1999]] - [[Uchuu de La Ta Ta]] releases.
:[[2004]] - [[Door no Mukou de Bell ga Natteta]] releases.
:[[2010]] - [[ONE]] releases.
:[[2010]] - [[○○ Ganbaranakutemo Eenende!!]] releases.{{TDiHBottom}}
----
July 29
:[[2006]] - [[Wakkyanai(Z)]] releases.
:[[2009]] - [[Sekai wa Summer Party]] releases.{{TDiHBottom}}
----
July 30
:[[2003]] - [[Shabondama]] releases.
:[[2008]] - [[Edo no Temari Uta II]] releases.
:[[2013]] - [[Jang Da Yeon]] leaves Hello! Pro Korea and Up-Front Agency.{{TDiHBottom}}
----
July 31
:[[2000]] - [[Koi ga Suteki na Kisetsu]] releases.{{TDiHBottom}}
----
August 1
:[[2001]] - [[Futari Gurashi]] releases.
:[[2004]] - [[Tsuji Nozomi]] and [[Kago Ai]] graduate from [[Morning Musume]].
:[[2007]] - [[4th Ai no Nanchara Shisuu]] releases.
:[[2007]] - [[Hana wo Pu-n / Futari wa NS]] releases.{{TDiHBottom}}
----
August 2
:[[2006]] - [[Waracchaou yo BOYFRIEND]] releases.{{TDiHBottom}}
----
August 3
:[[2005]] - [[21ji Made no Cinderella]] releases.
:[[2011]] - [[Uchouten LOVE]] releases.{{TDiHBottom}}
----
August 4
:[[1999]] - [[Unchain My Heart]] releases.
:[[2004]] - [[Shining Itoshiki Anata]] releases.{{TDiHBottom}}
----
August 5
:[[1998]] - [[Karasu no Nyoubou]] releases.{{TDiHBottom}}
----
August 6
:[[2003]] - [[Iku ZYX! FLY HIGH]] releases.
:[[2011]] - [[Makeruna Wasshoi!]] releases.{{TDiHBottom}}
----
August 7
:[[2013]] - [[Lady Mermaid / Eiya-sa! Brother / Kaigan Seisou Danshi]] releases.{{TDiHBottom}}
----
August 8
:[[2007]] - [[Itoshiki Tomo e]] releases.{{TDiHBottom}}
----
August 9
:[[2000]] - [[Ai no Chikara]] releases.
:[[2006]] - [[Ao]] releases.{{TDiHBottom}}
----
August 10
:[[1999]] - [[Melon Kinenbi]] is formed.
:[[2005]] - [[Hitorijime]] releases.
:[[2010]] - [[The Best Buono!]] releases.
:[[2011]] - [[Aa, Yo ga Akeru]] releases.
:[[2011]] - [[partenza]] releases.
:[[2013]] - [[Hotaru Matsuri no Hi]] releases.{{TDiHBottom}}
----
August 11
:[[2004]] - [[Koi no Telephone GOAL]] releases.{{TDiHBottom}}
----
August 12
:[[2009]] - [[sweet suicide summer story]] releases.
:[[2009]] - [[Nanchatte Ren'ai]] releases.{{TDiHBottom}}
----
August 13
:[[2003]] - [[22sai no Watashi]] releases.
:[[2013]] - [[Best Friend (2013.8.10 Birthday Live ver.)]] releases.{{TDiHBottom}}
----
August 14
:[[2008]] - [[blue]] releases.
:[[2011]] - [[Nakanishi Kana]], [[Kosuga Fuyuka]], [[Takeuchi Akari]], [[Katsuta Rina]], and [[Tamura Meimi]] join [[S/mileage]] as sub-members.{{TDiHBottom}}
----
August 18
:[[2004]] - [[Aa Ii na!]] releases.{{TDiHBottom}}
----
August 20
:[[2003]] - [[SEXY NIGHT ~Wasurerarenai Kare~]] releases.
:[[2008]] - [[Gachinko de Ikou!]] releases.{{TDiHBottom}}
----
August 21
:[[2002]] - [[Yaruki! IT'S EASY]] releases.
:[[2002]] - [[Zenbu! Petitmoni]] releases.{{TDiHBottom}}
----
August 22
:[[1999]] - [[Goto Maki]] joins Morning Musume as the 3rd generation.
:[[2001]] - [[Jounetsu Yuki Miraisen]] releases.
:[[2012]] - [[SHERBET]] releases.
:[[2012]] - [[Suki yo, Junjou Hankouki.]] releases.{{TDiHBottom}}
----
August 23
:[[2006]] - [[Country Musume Daizenshuu 2]] releases.{{TDiHBottom}}
----
August 25
:[[1999]] - [[DANCE & CHANCE]] releases.
:[[1999]] - [[Everyday Everywhere]] releases.
:[[2004]] - [[Happiness ~Koufuku Kangei!~]] releases.
:[[2006]] - [[Abe Asami (SI☆NA)]], [[Iwashima Manami]], [[Nakayama Nana]] & [[Suma Ai]] join [[Hello Pro Kansai]].
:[[2010]] - [[Dance de Bakoon!]] releases.{{TDiHBottom}}
----
August 26
:[[2009]] - [[Take It Easy!]] releases.{{TDiHBottom}}
----
August 27
:[[2003]] - [[Daite yo! PLEASE GO ON]] releases.
:[[2006]] - [[Ogawa Makoto]] graduates [[Morning Musume]] (again).
:[[2011]] - [[Ogawa Saki]] graduates from [[S/mileage]] and Hello! Project.{{TDiHBottom}}
----
August 28
:[[2002]] - [[Tokyo Bijin]] releases.
:[[2013]] - [[Wagamama Ki no Mama Ai no Joke / Ai no Gundan]] releases.{{TDiHBottom}}
----
August 29
:[[2000]] - [[Matsuura Aya]] joins Hello! Project.
:[[2007]] - [[Egao]] releases.{{TDiHBottom}}
----
August 30
:[[2009]] - [[Sawada Yuri]] leaves Hello! Project.
:[[2013]] - [[La mer]] releases.{{TDiHBottom}}
----
August 31
:[[1997]] - [[Heike Michiyo]] wins the Sharam Q Rock Vocalist Audition.
:[[1999]] - [[Kobayashi Azusa]] leaves [[Country Musume]] and Hello! Project.
:[[2005]] - [[Koi no Hana]] releases.{{TDiHBottom}}
----
September 2
:[[2009]] - [[School Days]] releases.{{TDiHBottom}}
----
September 3
:[[2003]] - [[4U ~Hitasura~]] releases.
:[[2010]] - [[Aoi Kuma]] releases.{{TDiHBottom}}
----
September 4
:[[2002]] - [[Romantic Ukare Mode]] releases.
:[[2002]] - [[All of Tanpopo]] releases.
:[[2013]] - [[8 Queen of J-POP]] releases.{{TDiHBottom}}
----
September 5
:[[2001]] - [[LOVE Namida Iro]] releases.
:[[2007]] - [[Onegai Miwaku no Target ~Mango-pudding Mix~]] releases.
:[[2012]] - [[Aitai Aitai Aitai na]] releases.{{TDiHBottom}}
----
September 6
:[[2000]] - [[I WISH]] releases.{{TDiHBottom}}
----
September 7
:[[2005]] - [[Miss Love Tantei]] releases.
:[[2011]] - [[Sekaiichi HAPPY na Onna no Ko]] releases.{{TDiHBottom}}
----
September 9
:[[1998]] - [[Daite HOLD ON ME!]] releases.
:[[1999]] - [[LOVE Machine]] releases.
:[[2009]] - [[Maeda Yuki Zenkyoku Shuu ~Kenchana~]] releases.
:[[2011]] - [[Kosuga Fuyuka]] leaves S/mileage.{{TDiHBottom}}
----
September 10
:[[2003]] - [[MI DA RA Matenrou]] releases.
:[[2008]] - [[5(FIVE)]] releases.
:[[2008]] - [[Come Together]] releases.{{TDiHBottom}}
----
September 11
:[[2002]] - [[Todoke! Koi no Telepathy]] releases.
:[[2013]] - [[Romance no Tochuu / Watashi ga Iu Mae ni Dakishimenakya ne (MEMORIAL EDIT) / Samidare Bijo ga Samidareru (MEMORIAL EDIT)]] releases.{{TDiHBottom}}
----
September 12
:[[2001]] - [[Minimoni Telephone! Rin Rin Rin / Minimoni Bus Guide]] releases.
:[[2007]] - [[Narihajimeta Koi no BELL]] releases.
:[[2012]] - [[13 Colorful Character]] releases.{{TDiHBottom}}
----
September 13
:[[2000]] - [[For ourself ~Single History~]] releases.
:[[2006]] - [[Thanks!]] releases.{{TDiHBottom}}
----
September 14
:[[2011]] - [[Kono Chikyuu no Heiwa wo Honki de Negatterun da yo!]] releases.
:[[2012]] - [[Oda Sakura]] joins Morning Musume as the 11th generation.{{TDiHBottom}}
----
September 15
:[[2009]] - [[Bokutachi, Zespri Kiwi da ne.]] releases.
:[[2010]] - [[Ameagari no Niji no you ni]] releases.
:[[2010]] - [[Genkimono de Ikou!]] releases.{{TDiHBottom}}
----
September 16
:[[2006]] - [[Minna no Ki]] releases.
:[[2009]] - [[EVERYDAY Zekkouchou!!]] releases.
:[[2009]] - [[SWEET BLACK]] releases.{{TDiHBottom}}
----
September 17
:[[2008]] - [[Dschinghis Khan Tartar Mix]] releases.{{TDiHBottom}}
----
September 18
:[[2003]] - [[Ai no Sono ~Touch My Heart!~]] releases.
:[[2003]] - [[Hare Ame Nochi Suki ♡]] releases.{{TDiHBottom}}
----
September 19
:[[2001]] - [[Afurechau... BE IN LOVE]] releases.
:[[2002]] - [[The Bigaku]] releases.
:[[2007]] - [[How to use SEXY]] releases.{{TDiHBottom}}
----
September 21
:[[2005]] - [[Ki ga Tsukeba Anata]] releases.{{TDiHBottom}}
----
September 22
:[[2010]] - [[Goto Maki COMPLETE BEST ALBUM 2001-2007 ~Singles & Rare Tracks~]] releases.{{TDiHBottom}}
----
September 23
:[[2002]] - [[Goto Maki]] graduates from [[Morning Musume]].
:[[2004]] - [[Koi no Nukegara]] releases.
:[[2009]] - [[Asu wa Date na no ni, Ima Sugu Koe ga Kikitai]] releases.{{TDiHBottom}}
----
September 24
:[[2008]] - [[Pepper Keibu]] releases.
:[[2011]] - [[Asaasamba]] releases.{{TDiHBottom}}
----
September 25
:[[2013]] - [[The Best! ~Updated Morning Musume~]] releases.{{TDiHBottom}}
----
September 26
:[[2002]] - [[BE HAPPY Koi no Yajirobee]] releases.
:[[2003]] - [[THE LAST NIGHT]] releases.
:[[2007]] - [[Ai Ai Daiko]] releases.
:[[2007]] - [[Jaja Uma Paradise]] releases.{{TDiHBottom}}
----
September 27
:[[2000]] - [[2nd STAGE]] releases.
:[[2006]] - [[Urara]] releases.{{TDiHBottom}}
----
September 28
:[[2011]] - [[Tachiagirl]] releases.{{TDiHBottom}}
----
September 29
:[[1999]] - [[Magic of Love]] releases.
:[[2004]] - [[Nishi Shinjuku de Atta Hito]] releases.
:[[2010]] - [[Onaji Jikyuu de Hataraku Tomodachi no Bijin Mama]] releases.
:[[2011]] - [[Iikubo Haruna]], [[Ishida Ayumi]], [[Sato Masaki]], and [[Kudo Haruka]] join Morning Musume as 10th generation members.{{TDiHBottom}}
----
September 30
:[[2009]] - [[Kono Mune no Tokimeki wo]] releases.
:[[2011]] - [[Takahashi Ai]] graduates from [[Morning Musume]] and Hello! Project.{{TDiHBottom}}
----
October 2
:[[2005]] - [[Ishimura Maiha]] graduates from [[Berryz Koubou]] and Hello! Project.
:[[2013]] - [[Motto Zutto Issho ni Itakatta / ROCK Erotic]] releases.{{TDiHBottom}}
----
October 3
:[[1999]] - [[Petitmoni]] is formed.{{TDiHBottom}}
----
October 4
:[[2006]] - [[Amasugita Kajitsu]] releases.
:[[2008]] - [[Lucky Aura]] releases.{{TDiHBottom}}
----
October 5
:[[2005]] - [[Kurenai no Kisetsu]] releases.{{TDiHBottom}}
----
October 6
:[[2004]] - [[Ren'ai Sentai Shitsu Ranger]] releases.{{TDiHBottom}}
----
October 7
:[[2009]] - [[Morning Musume Zen Single Coupling Collection]] releases.{{TDiHBottom}}
----
October 8
:[[2011]] - [[Reborn ~Inochi no Audition~]] releases.{{TDiHBottom}}
----
October 9
:[[2000]] - [[Taiyou to Ciscomoon|T&C Bomber]] disbands.{{TDiHBottom}}
----
October 10
:[[2007]] - [[Double Rainbow]] releases.
:[[2007]] - [[Danna-sama]] releases.
:[[2012]] - [[Wakuteka Take a chance]] releases.{{TDiHBottom}}
----
October 11
:[[2001]] - [[This is Unmei]] releases.
:[[2006]] - [[SOME BOYS! TOUCH]] releases.{{TDiHBottom}}
----
October 12
:[[2011]] - [[12, Smart]] releases.{{TDiHBottom}}
----
October 13
:[[2010]] - [[Akuma de Cute na Seishun Graffiti]] releases.
:[[2010]] - [[Afternoon Coffee]] releases.{{TDiHBottom}}
----
October 14
:[[2004]] - [[Robo Kiss]] releases.{{TDiHBottom}}
----
October 16
:[[2003]] - [[CRAZY ABOUT YOU]] releases.
:[[2011]] - [[S/mileage]] sub-members become full members.{{TDiHBottom}}
----
October 17
:[[2001]] - [[Koibito wa Kokoro no Ouendan]] releases.
:[[2007]] - [[Tokaikko Junjou]] releases.{{TDiHBottom}}
----
October 18
:[[2006]] - [[Melodies]] releases.{{TDiHBottom}}
----
October 19
:[[2005]] - [[Suki Sugite Baka Mitai]] releases.{{TDiHBottom}}
----
October 20
:[[1999]] - [[Seinaru Kane ga Hibiku Yoru]] releases.
:[[2004]] - [[Watarasebashi]] releases.{{TDiHBottom}}
----
October 21
:[[2009]] - [[Seishun-on-the-Road]] releases.{{TDiHBottom}}
----
October 22
:[[2000]] - [[Minimoni]] is formed.
:[[2003]] - [[Paradinome ~Koi ni Mi wo Yudanete~]] releases.{{TDiHBottom}}
----
October 23
:[[2002]] - [[Kousui]] releases.{{TDiHBottom}}
----
October 24
:[[2007]] - [[Iki wo Kasanemashou]] releases.
:[[2007]] - [[Morning Musume ALL SINGLES COMPLETE ~10th ANNIVERSARY~]] releases.
:[[2012]] - [[Amatsubu Pearl / Dakishimetai Dakishimetai]] releases.{{TDiHBottom}}
----
October 25
:[[1998]] - [[Dakedo Aishisugite]] releases.
:[[2000]] - [[Super Jet Shoes ~Mirai wo Aruku Kutsu~]] releases.
:[[2006]] - [[Cutie Queen Vol.1]] releases.
:2006 - [[Balalaika]] releases.
:[[2009]] - [[Umeda Erika]] graduates from [[℃-ute]] and Hello! Project.{{TDiHBottom}}
----
October 26
:[[2005]] - [[Suite Room Number 1]] releases.{{TDiHBottom}}
----
October 27
:[[1999]] - [[Taiyo & Ciscomoon 1]] releases.
:[[2004]] - [[Champagne no Koi]] releases.
:[[2010]] - [[Appare! Kaiten Zushi]] releases.{{TDiHBottom}}
----
October 28
:[[2007]] - [[Goto Maki]] graduates from Hello! Project.
:[[2009]] - [[Kimagure Princess]] releases.{{TDiHBottom}}
----
October 29
:[[2003]] - [[FIRST KISS]] releases.
:[[2008]] - [[Tan Tan Taan!]] releases.{{TDiHBottom}}
----
October 30
:[[2002]] - [[Koko ni Iruzee!]] releases.
:[[2009]] - [[Inaba Atsuko]] leaves Hello! Project.{{TDiHBottom}}
----
October 31
:[[2001]] - [[Mr.Moonlight ~Ai no Big Band~]] releases.
:[[2006]] - [[Murakami Megumi]] leaves [[℃-ute]] and [[Hello! Project]].
:[[2007]] - [[Honto no Jibun]] releases.{{TDiHBottom}}
----
November 1
:[[2000]] - [[Kokoro no Pheromone]] releases.{{TDiHBottom}}
----
November 2
:[[2011]] - [[Ai Kotoba (VOICE)]] releases.{{TDiHBottom}}
----
November 3
:[[1997]] - [[Ai no Tane]] releases.
:[[2004]] - [[Namida ga Tomaranai Houkago]] releases.{{TDiHBottom}}
----
November 5
:[[1997]] - [[GET]] releases.
:[[2008]] - [[MADAYADE]] releases.{{TDiHBottom}}
----
November 6
:[[2003]] - [[Go Girl ~Koi no Victory~]] releases.
:[[2013]] - [[Tokai no Hitorigurashi / Aitte Motto Zanshin]] releases.{{TDiHBottom}}
----
November 7
:[[2001]] - [[Propose]] releases.
:[[2007]] - [[Chance!]] releases.
:[[2012]] - [[CAT'S EYE]] releases.
:[[2012]] - [[Forefore ~Forest For Rest~ / Boys be ambitious!]] releases.
:[[2012]] - [[Cabbage Hakusho / Forest Time]] releases.{{TDiHBottom}}
----
November 8
:[[2006]] - [[Aruiteru]] releases.{{TDiHBottom}}
----
November 9
:[[2005]] - [[Chokkan 2 ~Nogashita Sakana wa Ookiizo!~]] releases.
:[[2011]] - [[Amazuppai Haru ni Sakura Saku]] releases.{{TDiHBottom}}
----
November 10
:[[1999]] - [[Love, Yes I do!]] releases.
:[[2004]] - [[Koi no Jubaku]] releases.
:[[2010]] - [[Shining Power]] releases.{{TDiHBottom}}
----
November 11
:[[2009]] - [[Watashi no Mirai no Danna-sama / Ryuusei Boy]] releases.{{TDiHBottom}}
----
November 12
:[[2003]] - [[Senpai ~LOVE AGAIN~]] releases.
:[[2008]] - [[Rottara Rottara]] releases.{{TDiHBottom}}
----
November 13
:[[2002]] - [[BYE BYE Saigo no Yoru]] releases.{{TDiHBottom}}
----
November 14
:[[2001]] - [[Pittari Shitai X'mas!]] releases.
:[[2007]] - [[Shouri no BIG WAVE!!!]] releases.{{TDiHBottom}}
----
November 16
:[[2005]] - [[Dai 2 Seichouki]] releases.
:[[2011]] - [[Busu ni Naranai Tetsugaku]] releases.{{TDiHBottom}}
----
November 17
:[[2002]] - [[Boyfriend]] releases.
:[[2004]] - [[Sayonara "Tomodachi ni wa Naritakunai no"]] releases.
:[[2010]] - [[Idolulu]] releases.
:[[2010]] - [[Onna to Otoko no Lullaby Game]] releases.{{TDiHBottom}}
----
November 18
:[[1998]] - [[Last Kiss]] releases.
:[[2009]] - [[℃-ute Nandesu! Zen Single Atsumechaimashita! 1]] releases.
:[[2009]] - [[PARTY TIME / Watashi no Tamago]] releases.
:[[2012]] = The members of [[LoVendoЯ]] are announced.{{TDiHBottom}}
----
November 19
:[[2003]] - [[Mirakururun Grand Purin! / Pi~hyara Kouta]] releases.{{TDiHBottom}}
----
November 20
:[[2002]] - [[SHALL WE LOVE?]] releases.
:[[2002]] - [[C:BOX]] releases.{{TDiHBottom}}
----
November 21
:[[2001]] - [[Oujisama to Yuki no Yoru]] releases.
:[[2007]] - [[Mikan]] releases.
:[[2007]] - [[v-u-den Single Best 9 Vol.1 Omaketsuki]] releases.
:[[2012]] - [[② ℃-ute Shinsei Naru Best Album]] releases.{{TDiHBottom}}
----
November 22
:[[2006]] - [[Aisu Crea~m to My Purin]] releases.{{TDiHBottom}}
----
November 23
:[[2005]] - [[Gag 100 Kaibun Aishite Kudasai]] releases.
:[[2011]] - [[Busan Hatsu ~Kankoku Series Best~]] releases.{{TDiHBottom}}
----
November 24
:[[2010]] - [[MORE FRIENDS]] releases.
:[[2010]] - [[Click you Link me]] releases.
:[[2010]] - [[My School March]] releases.
:[[2010]] - [[Minna Happy! Mama no Uta]] releases.{{TDiHBottom}}
----
November 25
:[[1999]] - [[Chokotto LOVE]] releases.
:[[2009]] - [[Love&Peace=Paradise]] releases.{{TDiHBottom}}
----
November 26
:[[2004]] - [[Tensai! LET'S GO Ayayamu]] releases.
:[[2008]] - [[FOREVER LOVE]] releases.
:[[2008]] - [[COVER YOU]] releases.
:[[2008]] - [[Kimi ga Iru]] releases.{{TDiHBottom}}
----
November 27
:[[2002]] - [[Genki Jirushi no Oomori Song / Okashi Tsukutte Okkasui~!]] releases.
:[[2003]] - [[Genshoku GAL Hade ni Yukube!]] releases.{{TDiHBottom}}
----
November 28
:[[2001]] - [[100kai no KISS]] releases.
:[[2007]] - [[Tsukiatteru no ni Kataomoi]] releases.
:[[2012]] - [[Samui ne.]] releases.{{TDiHBottom}}
----
November 29
:[[2006]] - [[Naked Songs]] releases.
:[[2009]] - [[Suki-chan]] releases.{{TDiHBottom}}
----
November 30
:[[1999]] - [[Yukigeshiki]] releases.
:[[2005]] - [[Takaramono]] releases.{{TDiHBottom}}
----
December 1
:[[2004]] - [[ALL FOR ONE & ONE FOR ALL!]] releases.
:[[2004]] - [[THE Nimaime]] releases.
:[[2010]] - [[Aitai Lonely Christmas]] releases.
:[[2010]] - [[Fantasy! Juuichi]] releases.{{TDiHBottom}}
----
December 2
:[[1998]] - [[Odaiba Moonlight Serenade]] releases.{{TDiHBottom}}
----
December 3
:[[2003]] - [[Kawaii Kare]] releases.
:[[2008]] - [[Screen]] releases.{{TDiHBottom}}
----
December 4
:[[2002]] - [[Minihamus no Kekkon Song]] releases.
:[[2013]] - [[Ijiwaru Shinai de Dakishimete yo / Hajimete wo Keiken-chuu]] releases.{{TDiHBottom}}
----
December 5
:[[2001]] - [[Minihamus no Ai no Uta]] releases.
:[[2001]] - [[Ai wa Muteki ~Hatachi no Yoru no Chikai~]] releases.
:[[2007]] - [[Yattarouze!]] releases.{{TDiHBottom}}
----
December 6
:[[2000]] - [[Snow Paradise]] releases.
:[[2006]] - [[Munasawagi Scarlet]] releases.
:[[2006]] - [[FRUITY KILLER TUNE]] releases.
:[[2009]] - [[Kusumi Koharu]] graduates from [[Morning Musume]] and Hello! Project.{{TDiHBottom}}
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December 7
:[[2005]] - [[Special! Best Mini ~2.5 Maime no Kare~]] releases.{{TDiHBottom}}
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December 8
:[[1999]] - [[Marui Taiyou -winter ver.-]] releases.
:[[2004]] - [[Ai no Dai 6 Kan]] releases.
:[[2010]] - [[Warugaki 1]] releases.{{TDiHBottom}}
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December 9
:[[2005]] - [[unaffected]] releases.{{TDiHBottom}}
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December 10
:[[2003]] - [[Shiroi TOKYO]] releases.
:[[2006]] - [[Mitsui Aika]] joins [[Morning Musume]] as an 8th generation member.
:[[2008]] - [[Abe Natsumi ~Best Selection~ 15 Shoku no Nigaoe Tachi]] releases.
:2008 - [[Country Musume Mega Best]] releases.
:2008 - [[MEGA MELON]] releases.
:2008 - [[Legend]] releases.
:2008 - [[Minna no Tamago]] releases.
:2008 - [[Taiyo to Ciscomoon / T&C Bomber Mega Best]] releases.
:2008 - [[Tanpopo / Petitmoni Mega Best]] releases.{{TDiHBottom}}
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December 11
:[[2002]] - [[Sougen no Hito]] releases.{{TDiHBottom}}
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December 12
:[[1998]] - [[Nakazawa Yuko Dai Isshou]] releases.
:[[2001]] - [[Country Musume Daizenshuu 1]] releases.
:[[2007]] - [[Melon Juice]] releases.
:[[2012]] - [[NEXT MY SELF]] releases.{{TDiHBottom}}
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December 13
:[[2000]] - [[Ren'ai Revolution 21]] releases.
:[[2006]] - [[7.5 Fuyu Fuyu Morning Musume Mini!]] releases.
:[[2008]] - [[Lalala-Sososo]] releases.{{TDiHBottom}}
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December 15
:[[2004]] - [[Morning Musume EARLY SINGLE BOX]] releases.{{TDiHBottom}}
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December 16
:[[2009]] - [[Bravo☆Bravo]] releases.
:[[2009]] - [[FRIENDS]] releases.{{TDiHBottom}}
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December 17
:[[2008]] - [[Kirari to Fuyu]] releases.{{TDiHBottom}}
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December 18
:[[2002]] - [[Sans Toi Ma Mie / Kimi to Itsumademo]] releases.
:[[2013]] - [[Ee ka!? / "Ii Yatsu"]] releases.{{TDiHBottom}}
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December 19
:[[2007]] - [[Kirarin☆Land]] releases.
:[[2012]] - [[WANT!]] releases.{{TDiHBottom}}
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December 21
:[[2005]] - [[Plein d'Amour ~Ai ga Ippai~]] releases.
:[[2011]] - [[Matsuura Aya 10TH ANNIVERSARY BEST]] releases.{{TDiHBottom}}
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December 23
:[[2002]] - [[Ishii Rika]] graduates from Hello! Project.{{TDiHBottom}}
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December 24
:[[2005]] - [[Goto Maki Premium Best 1]] releases.{{TDiHBottom}}
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December 26
:[[2012]] - [[ALMA COVERS]] releases.{{TDiHBottom}}
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December 28
:[[2011]] - [[Please Miniskirt Postwoman!]] releases.{{TDiHBottom}}
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December 29
:[[2004]] - [[Avenir ~Mirai~]] releases.{{TDiHBottom}}
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December 30
:[[2009]] - [[Melon Tea]] releases.{{TDiHBottom}}
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December 31
:[[2011]] - [[Maeda Yuuka]] graduates from [[S/mileage]] and Hello! Project.{{TDiHBottom}}
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