2012 Happenings

people
- 7 2 new groups
- 4 -8 disbanded groups
- 14 -4 new idols
- 6 -1 retirements
- 6 -15 graduations
- 0 0 born
- 17 -41 joined groups
- 2 -2 ex-leaders
- 2 0 new leaders
- 39 -7 left groups
music
- 11 -2 new albums
- 42 -18 new singles

December 2012
- 28
  - Heike Michiyo retires from show business
- 19
  - Berryz Koubou releases “WANT!”
- 12
  - Mano Erina releases “NEXT MY SELF”
- 5
  - Hello! Project releases “Pucchi Best 13”
    featuring Mano Erina, Morning Musume｡, Buono!, ANGERME, Berikyuu and CAT'S♥EYE 7
    
    H!P
  - Up Up Girls (Kari) releases “Chopper☆Chopper / Survival Girls”
November 2012
- 28
  - S/mileage releases “Samui ne｡”
- 21
  - ℃-ute releases “②℃-ute Shinsei Naru Best Album”
- 20
  - Mogi Minami leaves Hello! Project
    
    H!P
  - Mogi Minami retires from show business
  - Kanazawa Tomoko joins Hello! Project
    
    H!P
  - Ichioka Reina joins Hello! Project
    
    H!P
  - Kishimoto Yumeno joins Hello! Project
    
    H!P
  - Makino Maria joins Hello! Project
    
    H!P
  - Kaga Kaede joins Hello! Project
    
    H!P
  - Wada Sakurako joins Hello! Project
    
    H!P
  - Mogi Minami leaves HelloPro Kenshuusei
  - Kanazawa Tomoko joins HelloPro Kenshuusei
  - Ichioka Reina joins HelloPro Kenshuusei
  - Kishimoto Yumeno joins HelloPro Kenshuusei
  - Makino Maria joins HelloPro Kenshuusei
  - Kaga Kaede joins HelloPro Kenshuusei
  - Wada Sakurako joins HelloPro Kenshuusei
- 18
  - LoVendoЯ is formed
    with Tanaka Reina, Uozumi Yuki, Miyazawa Marin and Okada Marina
  - Okada Marina joins Hello! Project
    
    H!P
  - Uozumi Yuki joins Hello! Project
    
    H!P
  - Miyazawa Marin joins Hello! Project
    
    H!P
  - Tanaka Reina becomes leader of LoVendoЯ
- 7
  - Kikkawa You releases “Vocalist?”
  - CAT’S♥EYE 7 releases “Cat's♥Eye”
  - Peaberry and Harvest release “Cabbage Hakusho / Forest Time”
  - DIY♡ and GREEN FIELDS release “ForeFore〜Forest For Rest〜 / Boys be ambitious!”
  - Up Up Girls (Kari) releases “UPPER ROCK / Ichiban Girls!”
  - Peaberry and Harvest release “Forest Time / Cabbage Hakusho”
October 2012
- 28
  - Up Up Girls (Kari) releases “Kakko Tsukete Ii Desho!”
- 27
  - HelloPro Kenshuusei releases “Kanojo ni Naritai!!!”
- 14
  - CAT'S♥EYE 7 disbands
    with Shimizu Saki, Yajima Maimi, Sudou Maasa, Kumai Yurina, Nakajima Saki, Sugaya Risako and Hagiwara Mai
- 10
  - Morning Musume｡ releases “Wakuteka Take a chance”
- 9
  - Harvest is formed
    with Ishida Ayumi, Ikuta Erina, Takeuchi Akari and Satou Masaki
  - GREEN FIELDS is formed
    with Shimizu Saki, Mitsui Aika and Miyazaki Yuka
- 3
  - Up Up Girls (Kari) releases “End Of The Season”
September 2012
- 26
  - Up Up Girls (Kari) releases “Namen na! Ashi Girls / Marble Hero”
  - Kikkawa You releases “Darling to Madonna”
- 15
  - Oda Sakura leaves HelloPro Kenshuusei
  - Oda Sakura joins Morning Musume｡
- 14
  - ABCHO disbands
    with Ishikawa Rika and Yoshizawa Hitomi
- 12
  - Morning Musume｡ releases “⑬ Colorful Character”
- 5
  - ℃-ute releases “Aitai Aitai Aitai na”
August 2012
- 29
  - The Possible releases “Nanja Korya?!”
- 27
  - Yamaga Kanae leaves Hello! Project
    
    H!P
  - Yamaga Kanae retires from show business
  - Yamaga Kanae leaves HelloPro Kenshuusei
- 22
  - Buono! releases “SHERBET”
  - S/mileage releases “Suki yo､ Junjou Hankouki｡”
- 4
  - Up Up Girls (Kari) releases “Mecha Kyun♡Summer( ´ ▽ ` )ノ”
July 2012
- 25
  - CAT'S♥EYE 7 is formed
    with Shimizu Saki, Yajima Maimi, Sudou Maasa, Kumai Yurina, Nakajima Saki, Sugaya Risako and Hagiwara Mai
  - Berryz Koubou releases “cha cha SING”
  - Up Up Girls (Kari) releases “Uppercut! / Yuudachi! Through the Rainbow”
- 20
  - Peaberry is formed
    with Wada Ayaka and Sayashi Riho
  - DIY♡ is formed
    with Yajima Maimi, Tokunaga Chinami, Natsuyaki Miyabi, Nakajima Saki and Iikubo Haruna
- 11
  - Kikkawa You releases “Koko Kara Hajimarunda!”
- 4
  - Morning Musume｡ releases “One・Two・Three / The Matenrou Show”
June 2012
- 27
  - Mano Erina releases “Song for the DATE”
  - Up Up Girls (Kari) releases “BareBare I LOVE YOU”
- 22
  - Maeda Yuki retires from show business
- 20
  - Berikyuu releases “Chou HAPPY SONG”
- 17
  - Yamagishi Riko joins Hello! Project
    
    H!P
  - Nomura Minami joins Hello! Project
    
    H!P
  - Yamagishi Riko joins HelloPro Kenshuusei
  - Nomura Minami joins HelloPro Kenshuusei
- 13
  - Kitahara Sayaka releases “Natsu ga Yattekuru”
- 4
  - Okamura Rise joins Hello! Project
    
    H!P
  - Okamura Rise joins HelloPro Kenshuusei
May 2012
- 30
  - S/mileage releases “S/mileage Best Album Kanzenban ①”
- 23
  - ABCHO releases “Me wo Tojite Gyusshiyo”
- 19
  - Michishige Sayumi becomes leader of Morning Musume｡
- 18
  - Niigaki Risa leaves Hello! Project
    
    H!P
  - Niigaki Risa leaves Morning Musume｡
  - Niigaki Risa steps down as leader of Morning Musume｡
  - Mitsui Aika leaves Morning Musume｡
- 2
  - S/mileage releases “Dot Bikini”
- 1
  - Frances leaves Hello! Project
    
    H!P
  - Aiko leaves Hello! Project
    
    H!P
April 2012
- 25
  - Up Up Girls (Kari) releases “Going my ↑”
- 18
  - ℃-ute releases “Kimi wa Jitensha Watashi wa Densha de Kitaku”
- 11
  - Morning Musume｡ releases “Renai Hunter”
- 1
  - Murota Mizuki joins Hello! Project
    
    H!P
  - Murota Mizuki joins HelloPro Kenshuusei
March 2012
- 28
  - The Possible releases “②Shiawase no Akashi”
  - Mano Erina releases “More Friends Over”
  - Shibata Ayumi releases “Setsuna”
- 21
  - Berryz Koubou releases “Be Genki <Naseba Naru!>”
- 16
  - Uemura Akari joins Hello! Project
    
    H!P
  - Uemura Akari joins HelloPro Kenshuusei
- 13
  - Kosuga Fuyuka joins HelloPro Kenshuusei
- 10
  - Dream Morning Musume｡ disbands
    with Nakazawa Yuuko, Yasuda Kei, Iida Kaori, Abe Natsumi, Yaguchi Mari, Ishikawa Rika, Fujimoto Miki, Yoshizawa Hitomi, Ogawa Makoto and Kusumi Koharu
- 7
  - ABCHO is formed
    with Ishikawa Rika and Yoshizawa Hitomi
February 2012
- 28
  - Kitahara Sayaka releases “HAJIKE-YO!!”
- 25
  - The Possible releases “Sakurairo Romantic”
- 22
  - Berryz Koubou releases “Ai no Album⑧”
  - Mano Erina releases “Dokidoki Baby / Tasogare Kousaten”
- 15
  - Dream Morning Musume｡ releases “Shining Butterfly”
- 8
  - ℃-ute releases “Dai Nana Shou「Utsushikutte Gomen ne」”
- 1
  - S/mileage releases “Choto Mate Kudasai!”
January 2012
- 25
  - Morning Musume｡ releases “Pyocopyoco Ultra”
- 22
  - Hello! Project Mobekimasu disbands
    with Niigaki Risa, Michishige Sayumi, Tanaka Reina, Mano Erina, Shimizu Saki, Yajima Maimi, Tsugunaga Momoko, Tokunaga Chinami, Sudou Maasa, Natsuyaki Miyabi, Mitsui Aika, Kumai Yurina, Nakajima Saki, Sugaya Risako, Suzuki Airi, Okai Chisato, Wada Ayaka, Iikubo Haruna, Fukuda Kanon, Hagiwara Mai, Fukumura Mizuki, Ishida Ayumi, Nakanishi Kana, Ikuta Erina, Takeuchi Akari, Katsuta Rina, Sayashi Riho, Suzuki Kanon, Tamura Meimi, Satou Masaki and Kudou Haruka
  - Niigaki Risa leaves Hello! Project Mobekimasu
  - Niigaki Risa steps down as leader of Hello! Project Mobekimasu
  - Michishige Sayumi leaves Hello! Project Mobekimasu
  - Tanaka Reina leaves Hello! Project Mobekimasu
  - Mitsui Aika leaves Hello! Project Mobekimasu
  - Fukumura Mizuki leaves Hello! Project Mobekimasu
  - Ikuta Erina leaves Hello! Project Mobekimasu
  - Sayashi Riho leaves Hello! Project Mobekimasu
  - Suzuki Kanon leaves Hello! Project Mobekimasu
  - Shimizu Saki leaves Hello! Project Mobekimasu
  - Tsugunaga Momoko leaves Hello! Project Mobekimasu
  - Tokunaga Chinami leaves Hello! Project Mobekimasu
  - Sudou Maasa leaves Hello! Project Mobekimasu
  - Natsuyaki Miyabi leaves Hello! Project Mobekimasu
  - Kumai Yurina leaves Hello! Project Mobekimasu
  - Sugaya Risako leaves Hello! Project Mobekimasu
  - Yajima Maimi leaves Hello! Project Mobekimasu
  - Nakajima Saki leaves Hello! Project Mobekimasu
  - Suzuki Airi leaves Hello! Project Mobekimasu
  - Okai Chisato leaves Hello! Project Mobekimasu
  - Hagiwara Mai leaves Hello! Project Mobekimasu
  - Mano Erina leaves Hello! Project Mobekimasu
  - Wada Ayaka leaves Hello! Project Mobekimasu
  - Fukuda Kanon leaves Hello! Project Mobekimasu
  - Nakanishi Kana leaves Hello! Project Mobekimasu
  - Takeuchi Akari leaves Hello! Project Mobekimasu
  - Katsuta Rina leaves Hello! Project Mobekimasu
  - Tamura Meimi leaves Hello! Project Mobekimasu
  - Iikubo Haruna leaves Hello! Project Mobekimasu
  - Ishida Ayumi leaves Hello! Project Mobekimasu
  - Satou Masaki leaves Hello! Project Mobekimasu
  - Kudou Haruka leaves Hello! Project Mobekimasu
- 18
  - Kikkawa You releases “One for YOU!”
  - Buono! releases “Hatsukoi Cider / DEEP MIND”
- 15
  - The Possible releases “Kibou to Seishun no Hikari〜Come On! Pika! Pika!〜”
- 2
  - Kudou Haruka leaves HelloPro Kenshuusei
- 1
  - Gotou Maki retires from show business
  - Jang DaYeon retires from show business
  - Jang DaYeon leaves Hello! Project
    
    H!P
  - Gotou Maki discontinues soloist work
  - Jang DaYeon leaves HelloPro Kenshuusei