Professor Katsuyuki Kayama, a physics instructor, works within a campus environment marked by mutual animosity between himself and the student body. This hostile atmosphere fuels his professional dissatisfaction. Student Miki Watase, aiming to improve her grades unethically, targets him after he rejects her advances. In retaliation, she conspires with associates Hinata Takano, Arisa Kamijou, and Sachie Hurumi to drug his alcohol, incapacitating him. They photograph him in a compromised state while unconscious and distribute the images to publicly disgrace him.

This public humiliation triggers a profound transformation in Kayama. Shedding his previously passive and socially inept demeanor, he adopts a calculating and vengeful persona. He employs retaliatory photography to gather incriminating evidence against the involved students, using these materials to systematically exert control over them. His retribution escalates across subsequent events, incorporating physical aggression, sexual violence, and psychological manipulation. His approach varies: Sachie Hurumi, who harbored genuine affection for him, experiences comparatively less brutality and is coerced into becoming an accomplice. Under his direction, she facilitates assaults on other students, including Hinata and Arisa.

His methodology evolves to exploit interpersonal dynamics among the students, particularly leveraging Sachie’s coerced compliance to dominate others. The culmination of his vendetta focuses on the primary instigator, Miki Watase. Her punishment involves extended degradation, culminating in her betrayal of an uninvolved family member to mitigate her own suffering. This trajectory illustrates his complete metamorphosis from a marginalized academic into an authoritarian figure who extracts submission through intimate violations and relational coercion.