Sonoko Kawai is a retired Japanese singer, composer, producer, actor and former Idol from the multi member Idol group Onyanko Club, in which she was member #12. Sonoko was one of 16 Onyanko Club members who also had solo releases while a member of the group. She is known to be the only Onyanko Club member to compose a song on an Onyanko Club Album (Circle). After graduating from Onyanko Club in 1986 she recorded four more albums, then retiring in 1994 after marrying Onyanko Club producer Tsugutoshi Goto.