After three years at a distant boarding school, Sho finally graduates. On his nostalgic walk home, his stepmother Maki suddenly appears with a smile, having come to surprise him at the ceremony. He enjoys celebrating alone with the woman he has secretly admired, but she drinks too much and he escorts her to a hotel. Sho struggles to control himself around her defenseless body, until Maki gently entwines herself around him and begins guiding her adult stepson into a new stage of life in this adult role-play.