Yamaguchi, a ronin who has just started living alone to study for his entrance exams. He is tired from studying every day, but he is soothed by the kindness of his neighbor, Satomi... One day, he hears a scream from next door and rushes over to find Satomi writhing in pleasure as she masturbates. Yamaguchi, who has been living an abstinent life, is unable to control his reason at the sight of her lewd behavior and pushes her down with all the momentum of his youth. Satomi, who has not been paid attention to by her husband for a long time, cannot control herself at the pleasure of being desired by a young man...