Aoi has recently been troubled by the worsening behavior of her brother-in-law Shinichi, who lives with her. When he first started living with her as a college student, he was well-behaved, but at some point, he stopped going to school and left his room in a mess. To make matters worse, he made annoying noises every day. Finally fed up, Aoi sternly warned Shinichi one day. However, feeling irritated by the scolding, Shinichi retaliated the next day by forcing her to take his penis into her mouth. From that day on, Aoi's life began as the lowest form of a flesh toilet for her despicable brother-in-law...
