Tsuma Netori: Ryoujoku Rinne

Ikumi Sunohara, a newly appointed PE teacher, quickly gains the admiration of her male students due to her attractive appearance. However, Shiro Yasuno, a man with a disturbing past, sets his sights on her. He previously manipulated and enslaved Ikumi's best friend. Suspecting Shiro's involvement in her friend's disappearance, Ikumi searches his desk for clues. Unfortunately, Shiro ambushes her, knocking her unconscious. She awakens in a "training room" within an old school building, built by Shiro. Despite her anger and attempts to resist, Ikumi is now at the mercy of Shiro and his sinister intentions, as his "training" is about to begin. The anime explores themes of power, control, and the violation of trust.