One day, honor student Shiori visits the home of her reclusive classmate Yuuji. She is greeted by her father, Koji. At first glance, he appears to be a kind, elderly man, but in fact he is a former yakuza gangster who has been involved in a variety of underhanded activities. When Shiori is taken to Yusei's room, she is forced into a circle with Yusei and Koji. Yusei is also a collaborator of Kouji and others, and he had not been going to school because he enjoyed this kind of activity. Unable to resist out of fear, Shiori is forced to do as she is told, but gradually her masochistic nature begins to grow...
