おニャン子クラブ
She made her solo debut with the single on 25 March 1987. In April of that same year, Ushiroyubi Sasaregumi was disbanded because Takai graduated from Onyanko Club and moved on to other things. Onyanko Club itself disbanded in August later that year, and Iwai began working for Watanabe Productions (Nabe Pro) along with fellow Onyanko Club member Sonoko Kawai. She also began working under her nickname "Yūyu", turning it into a stage name.