"This can't be a coincidence." A series of murders strikes classmates one after the other. Takagi (Mamiya Shotaro) and Sonoko (Araki Yuko) investigate the truth and are convinced that the next target is "Chomage" Hadachi (Mori Yusaku). Takagi wants to protect his friend Hadachi at all costs. However, Hadachi, who lives a reclusive life in a messy room, rejects him, saying, "I'm not your friend." What has happened to Hadachi, who has closed his heart off? What is the secret of Hadachi that Takagi doesn't know?