Fumiko who came to a hot spring trip with her husband and son. My husband, who hadn't made time with his family because of his work, decided to travel this time because he was injured and realized the importance of his family. My son seemed to be absent from school, but gradually go to school through the unity of his family. Meanwhile, Fumiko was only interested in her son hiding and masturbating in her mother's underwear. Fumiko was pretending to be calm while noticing it, but her son finally took action on this trip ...