While recovering in the hospital, Seiji's relationship with his devoted girlfriend, Ai, is jeopardized by the appearance of his ex-girlfriend, Shouko, a nurse at the facility. Shouko uses blackmail and drugs to manipulate Seiji, eventually orchestrating a sadistic plot to force Ai into a traumatic encounter with her and an accomplice. Seiji is forced to witness the horror as Ai is drugged and violated, leaving both of them emotionally shattered.