A desperate housewife named Yukari Tachibana, struggling with her husband's lack of interest in sex, decides to hire a personal trainer in hopes of regaining his attention. However, she ends up falling for her young and handsome trainer, Takumi, who takes advantage of their intimate training sessions by touching her breasts, ass, and genitals without permission! Frustrated but aroused, Yukari gives in to her desires and initiates sexual contact during their second session at home. They move on to having passionate intercourse in various locations around the house while her husband is away. In the third session, they meet another trainer who joins them in the kitchen for some steamy action.
