S1·E4 The Kasha Incident

Sekiguchi reads more of "The Woman inside the Box", imagining himself as the protagonist. In it, he dismembers girls and wonders why he is unable to keep their heads alive. He resolves to meet the doctor that kept the girl alive in the box. In the main storyline, Kiba continues his flashback. Yōko asks Kiba to investigate, despite the Kanagawa police having jurisdiction. Later, Suzaki is found murdered, and Amemiya disappears. Back in the present, Sekiguchi's editor asks him to review a manuscript from Shunkō Kubo. A gloved man dismembers a prostitute. After Kiba is suspended from the Tokyo police, Bunzō Aoki asks him for help on the Musashino dismemberment case and Kanako's kidnapping. Kiba investigates Yōko and discovers that, during her film career, she was stalked by someone matching Suzaki's description. Kiba also investigates Mimasaka and discovers that he researched the creation of artificial, immortal soldiers during the war.