2012 was the 15th anniversary of Hello! Project, the year in which Niigaki Risa graduated from Hello! Project and Oda Sakura joined Morning Musume.
Members
Niigaki Risa graduation
Oda Sakura introduction
- January: Hello Pro Egg becomes Hello Pro Kenshuusei
- February: ABCHO is formed
- March 16: Kosuga Fuyuka, Uemura Akari, Murota Mizuki, and Okamura Rise join Hello Pro Kenshuusei
- March 23: Kizawa Runa joins Smile Gakuen
- March 25: Miyazaki Yuka and Tasaki Asashi join UP-FRONT PROMOTION.
- March 27: Oha Girl Maple disbands
- May 18:
- Niigaki Risa graduates from Morning Musume and Hello! Project
- Mitsui Aika graduates Morning Musume
- Michishige Sayumi becomes leader of Morning Musume and Hello! Project.
- May: Da Xiao Jie leaves Hello! Project
- June 17: Yamagishi Riko and Nomura Minami join Hello Pro 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
Singles
Forefore ~Forest For Rest~/Boys be ambitious! - DIY♡/GREEN FIELDS
- 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 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)
- May 2: Dot Bikini - S/mileage
- May 9: Jounetsuism - Rin
- 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 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 27: Kanojo ni Naritai!!! - Hello Pro Kenshuusei
- November 7:
- Cabbage Hakusho / Forest Time - Peaberry / Harvest (indies debut)
- Forefore ~Forest For Rest~ / Boys be ambitious! - DIY♡ / GREEN FIELDS (indies debut)
- 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
13 Colorful Character - Morning Musume
- January 18: One for YOU! - Kikkawa Yuu (debut)
- February 2: Dainana Shou "Utsukushikutte Gomen ne" - ℃-ute
- February 12: Buono! Paris Collection - Buono!
- February 22: Ai no Album ⑧ - Berryz Koubou
- March 28:
- May 30: S/mileage Best Album Kanzenban ① - S/mileage
- 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
DVDs
Stacy's - Morning Musume
- January
- January 18: S/mileage Concert Tour 2011 Aki ~Gyakushuu no Mini Skirt~ (Blu-ray) - S/mileage
- February
- February 8: Gomennasai - Buono!
- February 15: See You-karin ~Special Making Edition~ - Maeda Yuuka
- February 18:
- February 29: Berryz Koubou & ℃-ute Collaboration Concert Tour 2011 Autumn ~BeriKyuu Island~ (DVD + Blu-ray) - BeriKyuu
- March
- March 7:
- March 9: RIHO - Sayashi Riho
- April
- April 14: Morning Musume DVD Magazine Vol.43
- April 18: Lily - Kumai Yurina
- April 19: Morning Musume Niigaki Risa Sotsugyou Memorial
- April 25: Momochi Hatachi - Tsugunaga Momoko
- May
- May 16:
- S/mileage no Music V Collection ② (DVD) - S/mileage
- as it is - Niigaki Risa
- May 18: Morning Musume Mitsui Aika Sotsugyou Memorial
- May 23: Buono! LIVE 2012 “R・E・A・L” (DVD + Blu-ray) - Buono!
- June
- June 6: UP TO DATE - Mano Erina
- June 13: S/mileage no Music V Collection ② (Blu-ray) - S/mileage
- June 27: Ikuta Erina ga 5 Gousha ni Niigaki Risa Fanclub Tour in Shizuoka - Ikuta Erina
- June 29: Greeting ~Kudo Haruka~ - Kudo Haruka
- June 30:
- Kimi wa Jitensha Watashi wa Densha de Kitaku MUSIC VIDEO Extra Ver. Clips - ℃-ute
- Kira★Kira Making DVD ~Special Version~ - Tanaka Reina
- July
- July 4:
- Buono! All Singles Music Video Blu-ray File2012 - Buono!
- Black Angels 2 ~Kuroki Kakusei Hen~ - Yajima Maimi
- July 11:
- Alo-Hello! 2 ℃-ute DVD (DVD + Blu-ray) - ℃-ute
- Mano Erina Single V Clips 2 (DVD) - Mano Erina
- Greeting ~Sato Masaki~ - Sato Masaki
- July 25: Koko ga Suki - Suzuki Airi
- July 27: Morning Musume 9ki Member Event ~Iwai Tanjoubi! Kanpai wa, Shuwa Shuwa Pon! HyaaHo~i! ♪( ´θ｀)ノ~/Morning Musume 10ki Member Event ~Iwai Tanjoubi ＼(^O^)／ Konya no Shuyaku wa... Maa-chan!~ - Morning Musume (9th and 10th Generation)
- August
- August 3: Black Angels 3 ~Kuroki Shitou Hen~ - Yajima Maimi
- August 8:
- Berryz Koubou Concert Tour 2012 Haru ~Berryz Station~ (DVD + Blu-ray) - Berryz Koubou
- Mano Erina Single V Clips 2 (Blu-ray) - Mano Erina
- Yajima Maimi & Suzuki Airi Acoustic Live at Yokohama BLITZ - Yajima Maimi, Suzuki Airi
- August 15: ℃-ute Concert Tour Haru Natsu 2012 ~Utsukushikutte Gomen ne~ (DVD + Blu-ray) - ℃-ute
- August 18: Greeting ~Ishida Ayumi~ - Ishida Ayumi
- August 27: Mosuma FC Event ~Gachi☆Kira~ - Morning Musume (9th and 10th Generation), S/mileage 92nd Generation)
- August 29:
- August 30: Greeting ~Iikubo Haruna~ - Iikubo Haruna
- September
- September 12: Stacy's - Morning Musume
- September 15:
- September 26:
- Mano Erina Concert Tour 2012 ~DATE~ FINAL - Mano Erina
- HyaaHo~i♪( ´θ｀)ノ - Sayashi Riho
- October
- October 13: Orange - Tokunaga Chinami
- October 28: Morning Musume DVD MAGAZINE Vol.47
- November
- November 7: HARUKA - Kudo Haruka
- November 14: Eizou The Morning Musume 7 ~Single M Clips~ (DVD) - Morning Musume
- November 23: Sora no Kanata e - Nagasawa Wakana
- December
- December 5:
- Berryz Koubou Tanabata Special Live 2012 - Berryz Koubou
- Kaidan Shin Mimibukuro•Igyou - S/mileage
- "S/mileage Best Album Kanzenban ①" Hatsubai Kinen Special Concert - S/mileage
- December 12:
- Eizou The Morning Musume 7 ~Single M Clips~ (Blu-ray) - Morning Musume
- PIZZA-LA Presents Buono! Delivery LIVE 2012 ~Ai wo Otodoke!~ (DVD + Blu-ray) - Buono!
- December 19:
- Gekidan Gekiharo Dai 12kai Kouen Cat's♥Eye A - Cat's♥Eye 7 (BeriKyuu)
- Gekidan Gekiharo Dai 12kai Kouen Cat's♥Eye B - Cat's♥Eye 7 (BeriKyuu)
- Chelsie - Yajima Maimi
- December 25: Ikuta Erina no "Niigaki-san wo Ouen Suru Kai Dai Ikkai Kaigou ~Niigaki-san no Tanjoubi wo Katte ni Iwau Kai~" - Ikuta Erina
- December 26:
- Alo-Hello! 6 Morning Musume DVD (DVD + Blu-ray) - Morning Musume
- ℃-ute Cutie Circuit 2012 ~9gatsu 10ka wa ℃-ute no Hi~ - ℃-ute
Concerts
- January 2 - January 22: Hello! Project 2012 WINTER Hello☆Pro Tengoku ~Rock-chan~
- January 3 - January 22: Hello! Project 2012 WINTER Hello☆Pro Tengoku ~Funky-chan~
- January 28 - February 18: Buono! LIVE 2012 “R・E・A・L”
- February 18 - May 18: Morning Musume Concert Tour 2012 Haru ~Ultra Smart~ Niigaki Risa Mitsui Aika Graduation Special
- March 3: Yajima Maimi & Suzuki Airi Acoustic Live at Yokohama BLITZ
- March 3 - April 8: Berryz Koubou Concert Tour 2012 Haru ~Berryz Station~
- March 31: Hello Pro Kenshuusei Happyoukai 2012 ~3gatsu no Nama Tamago Show!~
- April 14 - June 30: ℃-ute Concert Tour Haru Natsu 2012 ~Utsukushikutte Gomen ne~
- June 9 - June 23: Mano Erina Concert Tour 2012 ~DATE~ FINAL
- June 17: Hello Pro Kenshuusei Happyoukai 2012 ~6gatsu no Nama Tamago Show!~
- July 7: Berryz Koubou Tanabata Special Live 2012
- July 21 - August 19: Hello! Project Tanjou 15 Shuunen Kinen Live 2012 Natsu ~Ktkr Natsu no FAN Matsuri!~
- July 22 - August 19: Hello! Project Tanjou 15 Shuunen Kinen Live 2012 Natsu ~Wkwk Natsu no FAN Matsuri!~
- August 25 - September 2: PIZZA-LA Presents Buono! Delivery LIVE 2012 ~Ai wo Otodoke!~
- September 9: Hello Pro Kenshuusei Happyoukai 2012 ~9gatsu no Nama Tamago Show!~
- September 10: ℃-ute Cutie Circuit 2012 ~9gatsu 10ka wa ℃-ute no Hi~
- September 15 - December 15: Morning Musume Tanjou 15 Shuunen Kinen Concert Tour 2012 Aki ~Colorful Character~
- September 23 - November 10: S/mileage Live Tour 2012 Aki ~Choi Kawa Banchou~
- November 24 - December 30: ℃-ute Concert Tour 2012~2013 Fuyu ~Shinseinaru Pentagram~
- December 9: Hello Pro Kenshuusei Happyoukai 2012 ~12gatsu no Nama Tamago Show!~
Books
- February 15: Aya -aya- - Wada Ayaka
- March 6: Hatachi Momochi - Tsugunaga Momoko
- March 21: Suugaku♥Joshi Gakuen - Hello! Project
- March 28: Hello! Project BEST SHOT!! vol. 19 - Hello! Project
- March 30: Hello! Project 2012 WINTER Hello★Pro Tengoku Live Shashinshuu - Hello! Project
- April 25: Hello! Channel vol. 8 - Hello! Project
- April 27: ASCENSION - Niigaki Risa
- May 9: Kira ★ Kira - Tanaka Reina
- May 23: MANO DATE - Mano Erina
- May 25: Buono! in Paris "C'est bon!" - Buono!
- June 25: Kono Kaze ga Suki - Suzuki Airi
- June 30: RIVAL ~12 Shoujo no 10nen Monogatari - Hello! Project Kids (BeriKyuu)
- July 18: Hello! Channel vol. 9 - Hello! Project
- July 24: Alo-Hello! ℃-ute Sashinshuu 2012 - ℃-ute
- August 22: Morning Musume Concert Tour 2012 Haru ~Ultra Smart~ Live Shashinshuu - Morning Musume
- August 27: un deux trois - Sayashi Riho
- September 10: Morning Musume 9, 10ki 1st official Photo Book - Morning Musume (9th and 10th Generations)
- October 12: metamorphose - Tokunaga Chinami
- October 24: Hello! Channel ~Tabi wo Shichaimashita! Special~ vol.10 - Hello! Project
- October 27: Do - Kudo Haruka
- November 16: Alo-Hello! Morning Musume Photobook 2012 - Morning Musume
- November 21: Hello! Channel Best Selection - Hello! Project
- November 27: Hatachi - Yajima Maimi
- December 15: Kanyon 17 - Fukuda Kanon
- December 16: Alo-Hello! Morning Musume 9ki Shashinshuu - Morning Musume Qki
- December 18:
- 20sai 7gatsu 13nichi - Michishige Sayumi (ebook)
- Katachi - Takahashi Ai (ebook)
- La - Michishige Sayumi (ebook)
- Mano Erina - Mano Erina (ebook)
- Mano Erina Select Edition - Mano Erina (ebook)
- Sayashi Riho - Sayashi Riho (ebook)
- Sayuminglandoll - Michishige Sayumi (ebook)
- Tengoku no Door - Mano Erina (ebook)
- Tengoku no Door Select Edition - Mano Erina (ebook)
- Watashi - Takahashi Ai (ebook)
- December 26: Hello! Channel 11go 2013nen Shinshun Tokudaigo ~Mano Erina Sotsugyou Special!~ - Hello! Project
- December 27: Airi-aL - Suzuki Airi
Other
- March 3: Berryz Koubou's 8th anniversary
- April 4: S/mileage's 3rd anniversary
- June 11: ℃-ute's 7th anniversary
- September 14: Morning Musume's 15th anniversary