After 25 years of marriage, Kyoko's children have left home and she is left alone with her husband. Feeling lonely in a life where she is not seen as a woman, she takes the plunge and approaches her husband, but... she ends up seducing her husband's subordinate, Yoshio, who happened to come to the house by mistake. Unable to contain his excitement, Yoshio pushes Kyoko down. "I'm an old woman, are you sure you want me?" she asks, but her body throbs at the touch of his erect penis, and she loses herself in the age-gap sex with the young man...