2012

2012 was the 15th anniversary of Hello! Project and the year in which Niigaki Risa graduated Hello! Project.

Members

 * January 1: Kuwata Nozomi leaves NICE GIRL Project! Kenshuusei
 * February ?:
 * ABCHO is formed
 * Akahane Tsubura leaves NICE GIRL Project! Kenshuusei
 * March 16: Kosuga Fuyuka, Uemura Akari, Murota Mizuki, and Okamura Rise join Hello! Pro Kenshuusei
 * March 27: Oha Girl Maple disbands
 * May 5: Konno Rina leaves NICE GIRL Project! Kenshuusei
 * May 18: Niigaki Risa graduates from Morning Musume and Hello! Project
 * May ?:
 * Da Xiao Jie leaves Hello! Project
 * Sakaue Mayu and Gundo Miyu leave NICE GIRL Project! Kenshuusei
 * June 17: Yamagishi Riko and Nomura Minami join Hello! Pro Kenshuusei
 * June 30: Katsuta Reimi leaves NICE GIRL Project! Kenshuusei
 * July 20: DIY♡ and Peaberry are formed
 * July 25: Cat's Eye 7 is formed
 * August 26: Yamaga Kanae leaves Hello! Pro Kenshuusei
 * September 14: Oda Sakura joins Morning Musume as the 11th Generation
 * October 10: GREEN FIELDS and Harvest are formed
 * November 14: Mogi Minami leaves Hello! Pro Kenshuusei
 * November 18: The members of LoVendoЯ are announced
 * November 20: Kanazawa Tomoko, Ichioka Reina, Kaga Kaede, Kishimoto Yumeno, Makino Maria, and Wada Sakurako join Hello! Pro Kenshuusei
 * November or December?: Kanno Mako joins NICE GIRL Project! Kenshuusei
 * Chiba Azusa and Koyama Rio join NICE GIRL Project! Kenshuusei
 * Chiba Ayaka, Inoue Reon, Sasatsuka Shiori leave NICE GIRL Project! Kenshuusei
 * Chiba Ayaka, Inoue Reon, Sasatsuka Shiori leave NICE GIRL Project! Kenshuusei

Singles

 * January 18: Hatsukoi Cider/DEEP MIND - Buono!
 * January 25: Pyocopyoco Ultra - Morning Musume
 * February 1: Choto Mate Kudasai! - S/mileage
 * February 8:
 * HAJIKE-YO!! - Kitahara Sayaka
 * STUDY×STUDY - StylipS (debut)
 * February 15: Shining Butterfly - Dream Morning Musume
 * February 22: Doki Doki Baby/Tasogare Kousaten - Mano Erina
 * March 14: Kimi no YELL - YuiKaori
 * March 21: Be Genki (Naseba Naru!) - Berryz Koubou
 * March 28: Setsuna - Shibata Ayumi
 * April 4: Yuke! Genki-kun - Hagiwara Mai (Single V)
 * April 11: Ren'ai Hunter - Morning Musume
 * April 18: Kimi wa Jitensha Watashi wa Densha de Kitaku - ℃-ute
 * April 25:
 * Going my ↑ - Up Up Girls (Kari) (indies debut)
 * Akane - ALMA KAMINIITO (debut)
 * May 2: Dot Bikini - S/mileage
 * May 16: MIRACLE RUSH - StylipS
 * May 23: Me wo Tojite Gyusshiyo - ABCHO
 * June 13: Natsu ga Yattekuru - Kitahara Sayaka
 * June 20: Chou HAPPY SONG - BeriKyuu
 * June 27:
 * Song for the DATE - Mano Erina
 * Barebare I LOVE YOU - Up Up Girls (Kari)
 * July 4:
 * One•Two•Three/The Matenrou Show - Morning Musume
 * Usagi tocome (feat. Goro) - Kopink
 * July 11: Koko Kara Hajimarunda! - Kikkawa Yuu
 * July 18: Raise - Ogura Yui
 * July 25:
 * cha cha SING - Berryz Koubou
 * Uppercut! / Yuudachi! Through the Rainbow - Up Up Girls (Kari)
 * August 22:
 * Suki yo, Junjou Hankouki. - S/mileage
 * Choose me♡Darling - StylipS
 * August 29:
 * Saikou Shikando - Kopink
 * Nanja Korya?! - THE Possible
 * Mechakyun♡Summer ( ´ ▽ ` )ﾉ - Up Up Girls (Kari)
 * September 5: Aitai Aitai Aitai na - ℃-ute
 * September 26:
 * Darling to Madonna - Kikkawa Yuu
 * Namen na! Ashi Girls/Marble Hero - Up Up Girls (Kari)
 * October 3: End Of The Season - Up Up Girls (Kari)
 * October 10: Wakuteka Take a chance - Morning Musume
 * October 24: Amatsubu Pearl/Dakishimetai Dakishimetai - ALMA KAMINIITO
 * October 27: Kanojo ni Naritai!!! - Hello! Pro Kenshuusei
 * October 31: Ueika!! - YuiKaori
 * November 7:
 * Cabbage Hakusho/Forest Time - Peaberry / Harvest
 * Forefore ~Forest For Rest~/Boys be ambitious! - DIY♡ / GREEN FIELDS
 * CAT'S♥EYE - Cat's♥Eye 7
 * UPPER ROCK / Ichiban Girls! - Up Up Girls (Kari)
 * November 28: Samui ne. - S/mileage
 * December 5:
 * Usagi tocome (feat. Kopink) - Kopink
 * Chopper☆Chopper / Survival Girls - Up Up Girls (Kari)
 * December 12: NEXT MY SELF - Mano Erina (last)
 * December 19: WANT! - Berryz Koubou

Albums

 * January 18: One for YOU! - Kikkawa Yuu (debut)
 * February 2: Dainana Shou "Utsukushikutte Gomen ne" - ℃-ute
 * February 22: Ai no Album 8 - Berryz Koubou
 * March 28:
 * More Friends Over - Mano Erina
 * 2 Shiawase no Akashi - THE Possible
 * May 30: S/mileage Best Album Kanzenban 1 - S/mileage
 * August 8: The Singles - Moritaka Chisato
 * August 22: SHERBET - Buono!
 * September 5: Hello! Cover - Niigaki Risa
 * September 12: 13 Colorful Character - Morning Musume
 * November 7: Vocalist? - Kikkawa Yuu
 * November 21: 2 ℃-ute Shinsei Naru Best Album - ℃-ute
 * December 5: Petit Best 13 - Hello! Project