From Wikipedia
°C-ute is an all-female Japanese pop group within Hello! Project. The character "°C" (degree Celsius) is substituted for "C" in notation for the purpose of expressing ardor—the hyphen doesn't have any meaning in particular. The proper pronunciation for this group in Japanese is kyūto (キュート, kyūto?) with pitch accents on both "ū" and "o"
At the time of debut, the members were: Maimi Yajima(leader), Saki Nakajima, Airi Suzuki, Chisato Okai, Mai Hagiwara, Megumi Murakami, Kanna Arihara, Erika Umeda
Sometime after debut Megumi Murakami, Kanna Arihara and Erika Umeda left the group for unknown reasons.
°C-ute was formed in the year 2005, consisting of seven girls from Hello! Project Kids who were not chosen to form the group Berryz Kobo. The group was officially announced on June 11, 2005, though its formation had been rumored for several months prior. Later, in January 2006, Kanna Arihara, a Hello Pro Egg, was added at the start of the Hello! Project Winter 2006 tour, as part of the Wonderful Hearts team. On October 31, 2006, Megumi Murakami left the group suddenly without any graduation ceremony. In July 2009, Kanna Arihara resigned from the group to fulfill her wish to lead a more normal life.
Prior to the band's formation, some members worked with members of Morning Musume in such side projects as Aa! and ZYX, as well as the MiniMoni movie Okashina Daibouken.
Incidentally, the Aa!, Berryz Kobo, and ℃-ute chain are in alphabetical order (ABC), and ZYX itself is in reverse alphabetical order (XYZ).
In 2017, ℃-ute officially made news of disbandment after over 12 years of activities. They held their final concert at Saitama Super Arena where celebrity guests attended. Among the many guests were: Nanami from OnePixcel (and a former kenshuusei), Otsuka Aina from Juice=Juice, the songwriter SHOCK-EYE, Sashihara Rino from HKT48 and former ℃-ute members Murakami Megumi, Umeda Erika, and Arihara Kanna. Backstage, the girls took pictures with CEO and producer Tsunku, past H!P eggs, PINK CRES., Momoiro Clover Z, and Hyadain. In total, the girls performed 36 songs songs (old and new) and some were from other H!P groups. June 12 marked the girls' final bow as a group and ended their reign after 4,385 days (12 Years, 4 Days, 23 Hours, 59 Minutes and 59).
In total, the girls have 9 albums, 3 Best of albums, 31 singles, and 6 indie singles.
After °C-ute
Suzuki Airi: solo career
Yajima Maimi: acting
Nakajima Saki: acting and environmental movements
Okai Chisato: variety shows
Hagiwara Mai: studying English abroad (studying)