Muneko came to the hot spring trip with her husband and son. Her husband, who had been devoted solely to work and hadn't spent time with his family, realized the importance of family after getting injured, leading to this trip. Their son had been truant but gradually started going to school again through family bonding. However, Muneko had one concern: her son was secretly masturbating with her underwear. Although she noticed, Muneko maintained her composure. But during this trip, her son finally took action...
