In the midst of puberty, Akira finds himself increasingly drawn to his mother Juri's alluring backside. One day, unable to suppress his feelings any longer, he honestly confesses to her, begging to touch her. However, Juri, suffering from chronic sexual frustration due to her deteriorating relationship with her husband, hesitates to reject his plea. Ultimately, giving in to her own desires, she accepts Akira's feelings, marking the beginning of a new, forbidden relationship.