Kyoufu no Bio Ningen Saishuu Kyoushi

Ganpachi Chabane arrives at a school ruled by violent student gangs and declares himself the teacher who will restore order. Student leader Hinako Shiratori refuses to submit, turning his campaign of discipline into an escalating battle with her and her followers.

His extraordinary resilience soon reveals a stranger explanation than mere determination: Ganpachi escaped from a genetic experiment. When someone from that past catches up with him, the struggle expands beyond schoolyard control into a chaotic confrontation between unnaturally powerful opponents.