Hiyori is 18 years old, and at the start of the new semester, her teacher, whom she hates to death, becomes her homeroom teacher. He looks at her with a nasty gaze and is the worst kind of guy. The teacher asks her to organize the library, and while she is working on it, she loses consciousness... In fact, sleeping pills were mixed into her water bottle. She is put to sleep and raped by her creepy homeroom teacher while being filmed... From that day until she graduates, Hiyori becomes her homeroom teacher's toy and is trained in all kinds of perverted sex. A record of an old teacher who devours young bodies all year round.