Hiroko Yai (Japanese: 矢井 弘子, Hepburn: Yai Hiroko; born February 12, 1959), better known by her stage name Nana Okada (岡田 奈々, Okada Nana), is a Japanese actress and former idol singer.
Source: “Nana Okada (singer, born 1959)”, English Wikipedia (CC BY-SA 4.0), excerpt