The disappearance of a female student at Sotan Private Academy has drawn the attention of Beautiful Girl Masked Heroine Aurora, who infiltrates the school disguised as a regular student to uncover the truth. While investigating the campus, she is ambushed by students and forced into a desperate situation, losing her transformation mask and rendered unable to transform. Seizing the opportunity, a mysterious janitor confronts her, and as Aurora battles enemy combatants and cyborgs, she is gradually overwhelmed—choked, pummeled with repeated body blows, and left battered until she loses consciousness. Captured and sold at a secret underground auction, she becomes a hostage subjected to injections of lust-inducing serum and torment with knotted ropes. What fate awaits Aurora?