former vocalist of carnabeats' younger brother band "". participated in the band april 1969 after keikichi usui left the group. after the dissolution of band, okada appeared in the musical "hair". after that, he performed solo activities, but retired at the end of the 1970s. entered the advertising industry, okada continued to be involved with the music industry as a advertising director and music producer, and was active as a commercial planner and producer.