Kosuke, who was in a rebellious period, treated his mother as a nuisance. When I invited him to my house for an AV viewing party with his friend Yuta, I found his mother, Shiori, who was not supposed to be there at that time. The two of them are having fun while playing a game. When Yuta went to clean up the dishes after eating, Shiori was standing in front of him. When she says something that can be taken as both flattering and serious, Shiori gets upset and slips, and Yuta, who reaches out to help her, gets injured. Feeling responsible for her, Shiori goes to Yuta’s house and begins taking care of him, including meals, bathing, and toileting. Yuta’s desire gradually escalates, and Shiori also reveals herself as a woman.