After her husband retires from the company where he worked for years, Yuka sees a chance to end her secret sexual relationship with their adult son Eitaro. But she cannot reject the son she loves, nor can she give up the pleasure of being desired as a woman. The adult mother-and-son role-play pair continue sneaking around behind her husband’s back and devouring each other whenever they find an opening. As their affair deepens, she begins dreaming of a life alone with her son.