Yoshihiko Ohse teaches at Aoi College. Students previously dismissed him as just another pervert, drastically underestimating the depths of his depravity. He detonates his reign of terror by planting bombs throughout the campus, taking the entire school hostage. His core motive demands absolute submission to his twisted appetites for torture, degradation, and sexual violence among the female students.

He operates as a deranged sadist, wielding the threat of explosives and physical confinement to dominate his victims. His arsenal includes psychological torment, sexual assault, and physical torture to feed his darkest fantasies. The character shows no remorse and possesses no redeeming traits, personifying ruthless exploitation of power over the hostages. His actions deliver graphic sexual violence and humiliation targeted at the students.

His background prior to the hostage crisis is never explored across official media, with no elaboration on his origins or development beyond this event. His entire role is confined to the single narrative arc of the OVA, lacking significant evolution or additional history in spin-offs, sequels, or related adaptations. The story's resolution sees a faculty member attempt intervention, but the character's ultimate fate remains undisclosed.

No canonical expansions exist regarding his appearances or development in other seasons, films, or expanded media beyond the original OVA.