Futoshi Satou is an overweight student with poor hygiene and an unattractive appearance, distinguished by glasses and black hair. His personality revolves around otaku interests in video games and social avoidance. He endures persistent bullying and financial extortion from classmates, primarily Akira Aihara, who steals his money and womanizes female students Nagisa Mizushiro and Yuna Sakurazawa. Satou harbors a specific romantic attraction toward Yuna, who initially treats him kindly before subsequent events.

A pivotal shift occurs when Satou receives a specialized cell phone from his inventor father, capable of hypnotizing anyone through its camera flash. After testing its effectiveness on his neighbor Sayuri, Satou transitions from victim to perpetrator. Using the hypnotic device, he pursues revenge against bullies, targeting female classmates for sexual manipulation and rape. His control expands to hypnotizing Yuna and other uninvolved women.

Satou's most intricate revenge targets Akira Aihara. Following Akira's physical assault after the hypnosis of female students, Satou forces Akira into a gender transformation. This involves hypnotic coercion to ingest estrogen pills, undergo breast augmentation surgery, adopt feminine clothing and makeup, and accept a female identity named Shouko Aihara. Satou further alters Shouko's personality and sexual orientation through hypnosis, making Shouko fall in love with him. The transformation culminates in Shouko voluntarily undergoing gender reassignment surgery to become a woman, after which Satou marries her.

Throughout his activities, Satou employs blackmail and orchestrates scenarios involving multiple perpetrators, including compelling Shouko to participate in the hypnotic enslavement of other girls. His manipulations extend to non-bullies such as teachers and neighbors.

In the anime adaptation, the explicit connection between Shouko and Akira is omitted. Shouko appears as a separate character without acknowledgment of the forced transformation, with others interacting with her as a naturally born girl unaware of any prior male identity. This diverges significantly from the source material.

No official media beyond the core OVA series and source game material provides additional character development or background expansions. The narrative concludes without depicting redemption or long-term consequences for Satou's actions across all known media.