Aya Matsusaki is a 41-year-old housewife. With her husband away for work, she lives alone with her son. While maintaining her role as a mother, she grows increasingly lonely and gradually begins to feel curiosity toward her son's body. One day, she brings a towel to him in the bathroom and is suddenly shocked by his words—her own son calls her a "pervert," shaking her emotionally. Deeply affected, she starts questioning their relationship...