Shiina, a strict honor student, discovers that the malicious Tamura-sensei has embezzled school funds and is attempting to frame the kind Tsukino-sensei. To protect the only teacher who truly appreciates her, Shiina agrees to Tamura's sexual demands in exchange for his silence. However, the situation spirals out of control when Tamura leaks photos of their encounter, leaving Shiina to endure public humiliation for the sake of Tsukino's career.
Tamura-sensei continues to exploit Shiina, using the secret of a colleague's embezzlement to force her into increasingly daring and degrading sexual acts. After forcing her to wear provocative clothing and crawl through the school hallways, he subjects her to a risky encounter on the rooftop. As Tamura reveals he has been sharing her images online, Shiina struggles with the terrifying realization that her body is beginning to crave the very abuse she hates.
Tamura continues to manipulate Shiina, forcing her into vulgar attire and challenging her to resist pleasure in public to protect Tsukino-sensei. Despite her efforts, Shiina's increasing sensitivity leads her to succumb, forcing her to verbally acknowledge her status as Tamura's slave. To further break her spirit, Tamura subjects her to a degrading act in a men's restroom, deepening her humiliation.
During a school trip, Shiina is forced into increasingly daring and degrading sexual encounters by Tamura. After a risky act on the bus, the tension escalates at the inn, where Tamura drugs Tsukino-sensei to force Shiina into lewd acts right beside the unconscious teacher. Torn between her guilt and overwhelming arousal, Shiina eventually surrenders to her desires and Tamura's absolute dominance.
After a heartbreaking attempt to confess her feelings to Tsukino-sensei reveals he is already in a relationship, a devastated Chizuru seeks solace in the arms of the manipulative Tamura-sensei. Convinced that Tamura is the only person who truly wants her, Chizuru fully surrenders her dignity, embracing a life of submission and public exhibitionism to satisfy her master's depraved desires.
Chizuru and her uncle visit a hot spring, where they meet a teacher and his student, leading to a daring partner swap and an intense group encounter. Following the trip, Chizuru is subjected to "bunny training" by her uncle, who uses provocative methods to break her stubborn attitude and force her to be honest about her desires.