2008 Happenings
- 20 new albums
- 38 new singles
- 10 new idols
- 8 joined groups
- 5 new groups
- 2 graduations
- 3 disbanded groups
- 7 left groups
- 1 new leaders
- 1 ex-leaders
January 2008
- 12 Ishii Rika releases “Nijiiro Button”
- 16 Abe Natsumi and Yajima Maimi release “16sai no Koi nante”
- 30 Korenaga Miki leaves HelloPro Egg
February 2008
- 6 Buono! releases “Renai♥Rider”
- 6 Ongaku Gatas releases “1st GOODSAL”
- 14 Athena & Robikerotts releases “Seishun! LOVE Lunch”
- 20 Buono! releases “Café Buono!”
- 20 The Possible releases “Love Message!”
- 27 ℃-ute releases “LALALA Shiawase no Uta”
March 2008
- 3 MilkyWay is formed
- 12 Berryz Koubou releases “Dschinghis Khan”
- 12 ℃-ute releases “3rd〜LOVE Escalation!〜”
- 16 ℃-ute releases “Cutie Kankousha Special CD〜Cutie Gudaguda Magoori〜”
- 19 Melon Kinenbi releases “Charisma・Kirei”
- 20 ℃-ute releases “Koero! Rakuten Eagles”
- 29 Mano Erina leaves HelloPro Egg
- 30 Mitsui Aika leaves Athena & Robikerotts
- 30 Athena & Robikerotts disbands
- 30 Okai Chisato leaves Athena & Robikerotts
- 30 Nakajima Saki leaves Athena & Robikerotts
- 30 Niigaki Risa leaves Athena & Robikerotts
- 30 Niigaki Risa steps down as leader of Athena & Robikerotts
April 2008
- 16 Morning Musume｡ releases “Resonant Blue”
- 17 High-King is formed
- 17 Tanaka Reina becomes leader of High-King
- 23 ℃-ute releases “Namida no Iro”
- 23 Fujimoto Miki releases “Okitegami”
- 23 v-u-den releases “Nanni mo Iwazu ni I LOVE YOU”
- 30 MilkyWay releases “Anataboshi”
- 30 The Possible releases “Kazoku e no Tegami”
- 30 Mutou Mika leaves Hello! Project
- 30 Mutou Mika leaves HelloPro Egg
- 30 Coconuts Musume｡ disbands
May 2008
- 14 Buono! releases “Kiss! Kiss! Kiss!”
- 21 Matsuura Aya releases “Kizuna”
June 2008
- 11 High-King releases “C\C (Cinderella\Complex)”
- 22 Kaneko Rie joins Hello! Project
- 22 Takeuchi Akari joins HelloPro Egg
- 22 Fukumura Mizuki joins HelloPro Egg
- 22 Kaneko Rie joins HelloPro Egg
- 22 Fukumura Mizuki joins Hello! Project
- 22 Takeuchi Akari joins Hello! Project
- 29 Okada Yui leaves Hello! Project
- 29 Mano Erina releases “Mano Piano”
- 29 v-u-den disbands
July 2008
- 9 Berryz Koubou releases “Yuke Yuke Monkey Dance”
- 16 Kusumi Koharu releases “Papancake”
- 23 MilkyWay releases “Kirarin☆Revolution Song Selection 3”
- 30 ℃-ute releases “Edo no Temari Uta II”
August 2008
- 6 The Possible releases “Ijiwaru Crazy love”
- 14 Ishii Rika releases “blue”
- 20 Buono! releases “Gachinko de Ikou!”
- 27 MilkyWay releases “Kirarin☆Revolution Song Selection 4”
September 2008
- 10 Berryz Koubou releases “5 (FIVE)”
- 10 Ongaku Gatas releases “Come Together”
- 17 The Possible releases “Kyuukyoku no THE Possible Best Number Shuu①”
- 19 Shugo Chara Egg! is formed
- 24 Morning Musume｡ releases “Pepper Keibu”
October 2008
- 4 Mano Erina releases “Lucky Aura”
- 12 HANGRY&ANGRY-f is formed
- 12 Country Musume｡ releases “Country Musume｡ Mega Best”
- 29 MilkyWay releases “Tan Tan Taan!”
November 2008
- 1 Ishii Rika releases “Autumn Selection 2008”
- 5 Berryz Koubou releases “MADAYADE”
- 12 Satoda Mai releases “Mousugu Christmas”
- 12 Buono! releases “Lotta Love Lotta Love”
- 19 HANGRY&ANGRY-f releases “Kill Me, Kiss Me”
- 20 ShenShen joins Hello! Project
- 20 Anchii joins Hello! Project
- 20 Guuchan joins Hello! Project
- 20 ReiRei joins Hello! Project
- 20 Ice Creamusume｡ is formed
- 20 Youko joins Hello! Project
- 20 PeiPei joins Hello! Project
- 24 Miyamoto Karin joins Hello! Project
- 24 Miyamoto Karin joins HelloPro Egg
- 26 ℃-ute releases “FOREVER LOVE”
- 26 Morning Musume｡ releases “COVER YOU”
December 2008
- 1 Ishii Rika releases “Winter Selection 2008”
- 3 Abe Natsumi releases “Screen”
- 10 Nakazawa Yuuko releases “Legend”
- 10 Akagumi 4 , Kiiro 5 , Aoiro 7 , 7nin Matsuri , 10nin Matsuri , Sannin Matsuri , Sexy 8 , Odoru♡11 , Happy♡7 , SALT5 , 7AIR , 11WATER , H.P. All Stars , Sexy Otonajan , Puripuri Pink and Elegies release “Hello! Project Shuffle Unit Mega Best”
- 10 Matsuura Aya , Morning Musume｡ , Melon Kinenbi , Berryz Koubou , v-u-den , ℃-ute , Ongaku Gatas , Buono! , Athena & Robikerotts , MilkyWay and High-King release “Pucchi Best 9”
- 10 Shugo Chara Egg! releases “Minna no Tamago”
- 10 Melon Kinenbi releases “MEGA MELON”
- 10 Tanpopo and Pucchimoni release “Tanpopo / Pucchimoni Mega Best”
- 10 Taiyou to Ciscomoon releases “Taiyou to Ciscomoon / T&C Bomber Mega Best”
- 10 Abe Natsumi releases “Abe Natsumi 〜Best Selection〜 15shoku no Nigaoetachi”
- 13 Mano Erina releases “Lalala-Sososo”
- 14 ℃-ute releases “℃-ute Special CD〜Cutie Gudaguda Christmas 2008〜”
- 17 MilkyWay releases “Kirari to Fuyu”