Psychiatrist Ritsuko (Tachibana) infiltrates the Hatanaka Research Institute using information obtained from patients captured by M-FORB. However, her identity is exposed, and she becomes prey to M-FORB. Meanwhile, Rui (Miki Tachibana) receives a call from Ritsuko without knowing the truth and rushes to the institute. There, she encounters the brainwashed Ritsuko, and gradually, without realizing the change in her, Rui herself is drawn into becoming M-FORB's next victim...