Koji secretly adores his beautiful, kind, and stylish aunt, Yoshika. Koji stays with Yoshika while he is commuting to school, but he is always in a state of discontent... Meanwhile, Yoshika, who has not had sex with her husband since Koji came to stay with her, is having unfulfilled nights. Yoshika's sexual frustration gradually grows as she indulges in masturbation in the bathroom, but Koji sees her in a lewd state...