Sachiko Kato, a Milf who no longer feels pleasure in sex with her husband. One night, her son, who has long been attracted to his mother's body, comes home from a night out, and she scolds him, trying to push him away. However, stimulated by his late-night activities, she gradually begins to provoke him, eventually taking the initiative to seduce him herself. The story captures her shifting emotions and the transformation of their relationship.