Kotomi and Miyuki, rivals for the affection of their friend Kenta, find themselves trapped in a building where people are mysteriously vanishing. As they discover a sadistic predator is stalking them using blackmail and fear, Miyuki is forced into humiliating acts while haunted by a family tragedy tied to the location. The situation turns dire when Kotomi is also targeted, leaving both girls in a desperate struggle for survival.
Isaku continues his sadistic campaign of coercion, targeting Miyuki and the school's admired "princess," Kotomi. While Miyuki is broken down into a submissive slave, Kotomi's pristine reputation is systematically destroyed through brutal degradation and forced sexual acts. Forced to witness the torment, Kenta watches as the girls' spirits are crushed under Isaku's absolute control.
The survivors endure Isaku's sadistic and degrading torture until the monster finally meets his end. Though freed from their physical captivity, the group is left with profound psychological scars, struggling to reconcile their trauma and find a way to move forward with their lives.