2007 Happenings
- 16 new albums
- 15 joined groups
- 41 new singles
- 8 graduations
- 15 left groups
- 4 retirements
- 4 new groups
- 5 disbanded groups
- 3 new leaders
- 3 ex-leaders
- 3 new idols
January 2007
- 2 Kikkawa You joins HelloPro Egg
- 2 LinLin joins HelloPro Egg
- 2 LinLin joins Hello! Project
- 2 Kikkawa You joins Hello! Project
- 10 Yutoku Ayumi joins Tomoiki・Ki wo Uetai
- 24 Morning Musume｡ Tanjou 10nen Kinentai releases “Bokura ga Ikiru MY ASIA”
- 28 Asami retires from show business
- 28 Asami steps down as leader of Country Musume｡
- 28 Miuna leaves Country Musume｡
- 28 Miuna leaves Hello! Project
- 28 Miuna retires from show business
- 28 Asami leaves Hello! Project
- 28 Asami leaves Country Musume｡
February 2007
- 14 Morning Musume｡ releases “Egao YES Nude”
- 18 The Possible releases “Shushoku = GOHAN no Uta”
- 21 ℃-ute releases “Sakura Chirari”
- 28 Kusumi Koharu releases “☆☆☆ (Mitsuboshi)”
March 2007
- 7 Berryz Koubou releases “VERY BEAUTY”
- 14 Abe Natsumi releases “25～Vingt-Cinq～”
- 14 The Possible releases “①Be Possible!”
- 15 LinLin leaves HelloPro Egg
- 15 JunJun joins Hello! Project
- 15 JunJun joins Morning Musume｡
- 15 LinLin joins Morning Musume｡
- 21 GAM releases “LU LU LU”
- 21 Morning Musume｡ releases “SEXY 8 BEAT”
- 24 GAM releases “Daisuki Rakuten Eagles”
- 26 Tsuji Nozomi leaves Hello! Project
- 26 Kago Ai leaves Hello! Project
- 26 W disbands
- 28 Melon Kinenbi releases “Unforgettable”
- 29 Mano Erina becomes a soloist
April 2007
- 4 RuRu releases “Shoshin”
- 11 Gotou Maki releases “Secret”
- 18 ℃-ute releases “②mini〜Ikiru to Iu Chikara〜”
- 25 Morning Musume｡ releases “Kanashimi Twilight”
May 2007
- 2 Kusumi Koharu releases “Happy☆彡”
- 6 Yoshizawa Hitomi steps down as leader of Morning Musume｡
- 6 Yoshizawa Hitomi leaves Morning Musume｡
- 7 Fujimoto Miki becomes leader of Morning Musume｡
- 9 Abe Natsumi releases “Too far away ～Onna no Kokoro～”
- 16 Tsuji Nozomi becomes a soloist
- 16 Tsuji Nozomi releases “Koko ni Iru zee!”
- 23 v-u-den releases “Koisuru♡Angel♡Heart”
- 23 GAM releases “1st GAM〜Amai Yuuwaku〜”
June 2007
- 1 Fujimoto Miki leaves Morning Musume｡
- 1 Kira☆Pika is formed
- 1 Fujimoto Miki steps down as leader of Morning Musume｡
- 2 Takahashi Ai becomes leader of Morning Musume｡
- 10 Hashida Mirei leaves HelloPro Egg
- 10 Hashida Mirei leaves Hello! Project
- 13 The Possible releases “Kingyo Sukui to Hanabi Takai”
- 13 The Possible releases “Natsu no Tropical Musume｡”
- 16 GAM disbands
- 18 Ongaku Gatas is formed
- 19 Nakazawa Yuuko releases “SONGS&MONOLOGUES... Kisetsu no Monogatari ～Kikitai Koto～”
- 27 Berryz Koubou releases “Kokuhaku no Funsui Hiroba”
July 2007
- 11 ℃-ute releases “Meguru Koi no Kisetsu”
- 12 Ishii Rika releases “Kimi wo Sagashiteru”
- 21 Buono! is formed
- 25 Morning Musume｡ releases “Onna ni Sachi Are”
August 2007
- 1 The Possible releases “Kaze no Uwasa”
- 1 Kira☆Pika releases “Hana wo Puun / Futari wa NS”
- 1 Berryz Koubou releases “4th Ai no Nanchara Shisuu”
- 7 Ogura Manami leaves HelloPro Egg
- 7 Ogura Manami leaves Hello! Project
- 7 Ogura Manami retires from show business
- 8 Morning Musume｡ Tanjou 10nen Kinentai releases “Itoshiki Tomo e”
- 8 Ishii Rika releases “Kagetsu Yoru”
- 29 Matsuura Aya releases “Egao”
September 2007
- 1 Kira☆Pika disbands
- 5 Okai Chisato joins Athena & Robikerotts
- 5 Melon Kinenbi releases “Onegai Miwaku no Target〜Mango Pudding Mix〜”
- 5 Niigaki Risa becomes leader of Athena & Robikerotts
- 5 Niigaki Risa joins Athena & Robikerotts
- 5 Mitsui Aika joins Athena & Robikerotts
- 5 Nakajima Saki joins Athena & Robikerotts
- 9 Gotou Maki releases “How to use SEXY”
- 12 Kira☆Pika releases “Kirarin☆Revolution Song Selection 2”
- 12 Ongaku Gatas releases “Narihajimeta Koi no BELL”
- 26 v-u-den releases “Jajauma Paradise”
- 26 Maeda Yuki releases “Ai Ai Daiko”
- 30 Morning Musume｡ Tanjou 10nen Kinentai disbands
October 2007
- 9 Ecomoni｡ disbands
- 10 Nakazawa Yuuko releases “Dannasama”
- 10 Matsuura Aya releases “Double Rainbow”
- 13 Morozuka Kanami leaves HelloPro Egg
- 13 Akiyama Yurika leaves HelloPro Egg
- 13 Hashimoto Aina leaves HelloPro Egg
- 13 Gotou Yuki leaves HelloPro Egg
- 13 Oose Kaede leaves HelloPro Egg
- 13 Okada Robin Shouko leaves HelloPro Egg
- 17 ℃-ute releases “Tokaikko Junjou”
- 24 Morning Musume｡ releases “Morning Musume｡ ALL SINGLES COMPLETE 〜10th ANNIVERSARY〜”
- 24 Abe Natsumi releases “Iki wo Kasanemashou”
- 28 Gotou Maki leaves Hello! Project
- 31 Buono! releases “Honto no Jibun”
November 2007
- 7 The Possible releases “HAPPY Fifteen”
- 8 Ishii Rika releases “Fuyu no Ashioto”
- 14 Athena & Robikerotts is formed
- 14 Athena & Robikerotts releases “Shouri no BIG WAVE!!!”
- 21 v-u-den releases “v-u-den Single Best 9 Vol.1 Omaketsuki”
- 21 Morning Musume｡ releases “Mikan”
- 28 Kusumi Koharu releases “Chance!”
- 28 Berryz Koubou releases “Tsukiatteru no ni Kataomoi”
- 30 Yutoku Ayumi leaves Hello! Project
- 30 Yutoku Ayumi leaves HelloPro Egg
- 30 Yutoku Ayumi leaves Tomoiki・Ki wo Uetai
- 30 Yutoku Ayumi retires from show business
December 2007
- 5 Ongaku Gatas releases “Yattarou ze!”
- 11 Saho Akari joins Tomoiki・Ki wo Uetai
- 12 Melon Kinenbi releases “Melon Juice”
- 12 Maeda Yuki , Morning Musume｡ , Melon Kinenbi , Berryz Koubou , v-u-den , ℃-ute , GAM , Morning Musume｡ Tanjou 10nen Kinentai , Kira☆Pika , Ongaku Gatas and Buono! release “Pucchi Best 8”
- 19 Kusumi Koharu releases “Kirarin☆Land”