Tomoya Ishiguro, a predatory antagonist, encounters a young teacher matching his name, appearance, and age at a soup restaurant. Learning the teacher will begin practical training at an all-girls high school, Tomoya drugs and incapacitates him to steal his identity and infiltrate the institution.

His core objective targets specific female students for transformation into compliant individuals under his control. He swiftly manipulates students Madoka and Mira into submission, then shifts focus to three primary targets: cheerleader Yumi Kirishima, swim team captain Seira Himeno, and theater club actress Asuka Minamoto.

Tomoya deploys manipulation, blackmail, and vulnerability exploitation. He observes gym teacher Saejima—boyfriend of Yumi's sister—making inappropriate advances toward Yumi. Tomoya positions himself as her rescuer to secure her compliance. With Seira, he overhears her references to consuming "herbs," identifies them as illegal drugs, and attempts blackmail. When she threatens police involvement instead of submission, he assaults her in anger.

For Asuka, Tomoya witnesses rival Miki Tachibana planting stolen tickets in Asuka's pocket to frame her. He escalates the setup by adding a substantial sum of money, then privately confronts Asuka with the fabricated evidence to coerce her obedience.

Operating under a time constraint due to the impersonation, Tomoya Ishiguro remains consistently predatory and manipulative throughout the narrative, utilizing deception and coercion against the students.