Happy

is the third opening theme song from the Japanese anime Kirarin Revolution. The song was released on May 2, 2007 and is performed by Koharu Kusumi from Morning Musume, credited as . The song was released as Kirari Tsukishima's third single, who Kusumi portrays in the show. Background and release "Happy" is the third opening theme song to Kirarin Revolution and is performed by Koharu Kusumi from Morning Musume, who voices the main character, Kirari Tsukishima. The song was released as the character's third single and Kusumi is credited as . Regarding the song, Kusumi said, "Listening to 'Happy' gave off a 'Koharu happy' kind of feeling." To promote the song, Oha Suta aired live-action episodic segments titled "The Secret Behind the New Song 'Happy'" from April 23, 2007 to May 2, 2007. The episode is a fictional account of how Kirari recorded the song with a "psychedelic" music director named Jake Shimamura, with Kusumi reprising her role from the show.