2010 Happenings

people
- 5 2 disbanded groups
- 3 -5 new groups
- 3 0 retirements
- 0 0 born
- 3 -5 new idols
- 11 -17 graduations
- 11 -1 left groups
- 0 0 ex-leaders
- 5 -23 joined groups
- 0 -2 new leaders
music
- 23 4 new albums
- 40 -6 new singles

December 2010
- 24
  - Kikkawa You leaves Hello! Project
    
    H!P
  - Kikkawa You leaves HelloPro Kenshuusei
- 21
  - Sengoku Minami leaves Hello! Project
    
    H!P
  - Sengoku Minami leaves HelloPro Kenshuusei
- 15
  - Kamei Eri retires from show business
  - Kamei Eri leaves Hello! Project
    
    H!P
  - JunJun leaves Hello! Project
    
    H!P
  - LinLin leaves Hello! Project
    
    H!P
  - Kamei Eri leaves Morning Musume｡
  - JunJun leaves Morning Musume｡
  - LinLin leaves Morning Musume｡
  - Muten Musume｡ (Morning Musume｡) disbands
    with Takahashi Ai, JunJun, Niigaki Risa, Kamei Eri, Michishige Sayumi, Tanaka Reina, LinLin and Mitsui Aika
  - Hello! Project releases “Pucchi Best 11”
    featuring Noto Arisa, Mano Erina, Morning Musume｡, Berryz Koubou, ℃-ute, Buono!, Guardians 4, ANGERME, Lilpri and Muten Musume｡ (Morning Musume｡)
    
    H!P
  - Kamei Eri releases “Hello Cover (Kamei Eri)”
  - Okai Chisato releases “Manatsu no Kousen”
  - Niigaki Risa releases “Seinaru Kane ga Hibiku Yoru”
  - Tsugunaga Momoko releases “Seinaru Kane ga Hibiku Yoru”
  - Yajima Maimi releases “Seinaru Kane ga Hibiku Yoru”
  - Suzuki Airi releases “Seinaru Kane ga Hibiku Yoru”
  - Okai Chisato releases “Egao ni Namida〜THANK YOU! DEAR MY FRIENDS〜”
- 12
  - Noto Arisa releases “a piece of Romance”
- 8
  - S/mileage releases “Warugaki ①”
- 1
  - Morning Musume｡ releases “Fantasy! Juuichi”
  - ℃-ute releases “Aitai Lonely Christmas”
November 2010
- 28
  - Okai Chisato releases “LOVE Namidairo”
- 24
  - Mano Erina releases “MORE FRIENDS”
  - Matsuura Aya releases “Click you Link me”
  - Tsuji Nozomi releases “Minna Happy! Mama no Uta”
  - S/mileage releases “My School March”
- 17
  - Lilpri releases “Idolulu”
  - Morning Musume｡ releases “Onna to Otoko no Lullaby Game”
- 10
  - Berryz Koubou releases “Shining Power”
- 2
  - Ice Creamusume｡ disbands
    with ShenShen, Anchii, PeiPei, Youko, ReiRei and Guuchan
  - ShenShen leaves Hello! Project
    
    H!P
  - Youko leaves Hello! Project
    
    H!P
  - Guuchan leaves Hello! Project
    
    H!P
  - PeiPei leaves Hello! Project
    
    H!P
  - ReiRei retires from show business
  - ReiRei leaves Hello! Project
    
    H!P
  - Anchii leaves Hello! Project
    
    H!P
  - Mutou Mika releases “Merry-go-round”
- 1
  - Shibata Ayumi releases “YOU&I”
October 2010
- 27
  - Morning Musume｡ releases “Appare Kaiten Zushi!”
- 13
  - Sugaya Risako releases “Oshare My Dream / Elegant Girl”
  - ℃-ute releases “Akuma de Cute na Seishun Graffiti”
- 6
  - The Possible releases “Watashi no Miryoku / LOVE² Paradise”
- 1
  - Afternoon Musumeδ is formed
    with Nakazawa Yuuko, Yasuda Kei, Iida Kaori, Abe Natsumi, Yaguchi Mari, Fujimoto Miki and Ogawa Makoto
  - Afternoon Musumeδ releases “Afternoon Coffee”
September 2010
- 29
  - S/mileage releases “Onaji Jikyuu de Hataraku Tomodachi no Bijin Mama”
- 22
  - Gotou Maki releases “Gotou Maki COMPLETE BEST ALBUM 2001-2007 ～Singles & Rare Tracks～”
- 15
  - Abe Natsumi releases “Ameagari no Niji no You ni”
  - Mano Erina releases “Genkimono de Ikou!”
- 3
  - Ishii Rika releases “Aoi Kuma”
August 2010
- 28
  - Muten Musume｡ (Morning Musume｡) is formed
    with Takahashi Ai, JunJun, Niigaki Risa, Kamei Eri, Michishige Sayumi, Tanaka Reina, LinLin and Mitsui Aika
- 25
  - ℃-ute releases “Dance de Bakoon!”
- 14
  - Noto Arisa releases “innocent as a BABY”
- 10
  - Buono! releases “The Best Buono!”
July 2010
- 28
  - Gotou Maki releases “ONE”
  - S/mileage releases “◯◯ Ganbaranakutemo Ee nen de!!”
- 25
  - Noto Arisa releases “END OF THE GATE”
- 14
  - Berryz Koubou releases “Maji Bomber!!”
- 7
  - Mutou Mika becomes a soloist
June 2010
- 30
  - Okada Yui retires from show business
- 16
  - Lilpri releases “Little♡Princess☆Pri! “
- 9
  - Morning Musume｡ releases “Seishun Collection”
- 3
  - Ongaku Gatas releases “READY! KICK OFF!!”
- 2
  - The Possible releases “Yabee Nabee na Atsuryoku bee naa”
May 2010
- 26
  - S/mileage releases “Yume Miru Fifteen”
- 19
  - Ootani Masae becomes a soloist
- 12
  - Mano Erina releases “Onegai Dakara・・・”
- 3
  - Melon Kinenbi disbands
    with Murata Megumi, Saitou Hitomi, Ootani Masae and Shibata Ayumi
April 2010
- 28
  - ℃-ute releases “Campus Life〜Umarete Kite Yokatta〜”
- 21
  - Melon Kinenbi releases “URA MELON”
- 7
  - Maeda Yuki releases “Mianhaeyo〜Gomennasai〜”
March 2010
- 31
  - Berryz Koubou releases “6th Otakebi Album”
  - Kago Ai releases “Kago Ai Meets Jazz ～The First Door～”
- 27
  - Shugo Chara Egg! disbands
    with Saho Akari, Fukumura Mizuki, Maeda Irori and Tanabe Nanami
  - Kudou Haruka joins Hello! Project
    
    H!P
  - Nagasawa Wakana joins Hello! Project
    
    H!P
  - Kizawa Runa joins Hello! Project
    
    H!P
  - Wada Ayaka leaves HelloPro Kenshuusei
  - Maeda Yuuka leaves HelloPro Kenshuusei
  - Ogawa Saki leaves HelloPro Kenshuusei
  - Fukumura Mizuki leaves Shugo Chara Egg!
  - Maeda Irori leaves Shugo Chara Egg!
  - Tanabe Nanami leaves Shugo Chara Egg!
  - Kudou Haruka joins HelloPro Kenshuusei
  - Nagasawa Wakana joins HelloPro Kenshuusei
  - Kizawa Runa joins HelloPro Kenshuusei
- 17
  - Morning Musume｡ releases “⑩ MY ME”
  - Lilpri is formed
    with Wada Ayaka, Maeda Yuuka and Fukuda Kanon
- 14
  - S/mileage releases “Otona ni Naru tte Muzukashii!!!”
- 10
  - Buono!, Shugo Chara Egg! and Guardians 4 release “Shugo Chara! Song ♪ Best”
- 3
  - Berryz Koubou releases “Otakebi Boy WAO! / Tomodachi wa Tomodachi Nanda!”
February 2010
- 28
  - Guardians 4 disbands
    with Mitsui Aika, Kumai Yurina, Nakajima Saki and Sugaya Risako
- 24
  - ℃-ute releases “Shocking 5”
  - Mano Erina releases “Haru no Arashi”
- 17
  - Melon Kinenbi releases “MELON'S NOT DEAD”
- 10
  - Buono! releases “We are Buono!”
  - Morning Musume｡ releases “Onna ga Medatte Naze Ikenai”
- 7
  - Noto Arisa releases “NO NIGHT EDEN”
- 3
  - Buono! releases “Our Songs”
January 2010
- 20
  - Shugo Chara Egg! and Guardians 4 release “Going On!”
- 6
  - ℃-ute releases “SHOCK!”