Onyanko Club
was a female Japanese pop music duo consisting of Yukiko Iwai and Mamiko Takai, formed in 1985. In parallel to their membership in this duo, Iwai and Takai were at the same time members of Onyanko Club, a large pop group widely seen as a precursor to groups such as Morning Musume and AKB48. Onyanko Club sang back-up vocals on some of the songs released by Ushiroyubi Sasaregumi. They are most notable for singing several of the theme songs for the anime television series "High School! Kimengumi".