Shugo Chara!
In April 2009, Hello! Project announced a new subgroup to perform music for the second season of the "Shugo Chara!" anime series, titled "Shugo Chara!! Doki". The group features Aika Mitsui from Morning Musume, Yurina Kumai and Risako Sugaya from Berryz Kobo, and Saki Nakajima from Cute. Their debut single, "Omakase Guardian", was first broadcast as "Shugo Chara!! Doki"'s opening theme song on April 4, 2009, beginning with episode 77. The song was released as a single on May 27, 2009, along with a cover version by Shugo Chara Egg! and "Summer Has Come!" as B-side songs. The video single was released on June 10, 2009.