Yuuko Kashiwagi is a 42-year-old milf, known in the neighborhood as part of a kind and loving couple. However, she harbors one secret frustration: her husband, preoccupied with overwork, no longer seems to notice her physical allure. Day after day, neglected and emotionally starved, she grows increasingly restless. One day, while cleaning her son's room, the lingering scent of young male sweat rising from the bed ignites her suppressed desires, and she can no longer resist—she begins touching herself. At that very moment, her son walks in, and everything changes.