Yuna Shiina, a beautiful teacher at a famous private school in Tokyo, is rumored to be the best in Tokyo and has excellent teaching skills. However, the incident happened during a supplementary class after school one day. She is asked for her body by a male student who is reputed to be the most talented student in the school, and Yuna, who has been hit by her demon, commits a one-time mistake. Yuna is informed by her vice-principal by a male teacher who happened to witness the scene.
