The confrontation between Yuko and Hideo comes to a gruesome head when Hideo goes on a rampage throughout the school. With Satomi missing, Shinichi must hurry and find her before Hideo can get to her first.

Shinichi is trying to discover how many parasytes are in his city. Shinichi tells Kana the truth about himself and his Parasyte but she does not believe him. However, her obsession with him leads her to disaster.