Box of Goblins

In 1953, after the events surrounding the Musashino dismemberment case, Atsuko Chūzenji reflects on her participation in the investigation. She recalls how the descriptions by the witnesses who reported seeing a white-gloved man reminded her of Kubo and how strange Kubo's story "The Woman inside the Box" was. She also recalls her earlier investigation of a murder of a man by his wife and wonders why she is drawn to bizarre and violent stories. She concludes that writing about them is a kind of act of purification.

Tatsumi Sekiguchi reads part of a transcript, titled "The Woman inside the Box" by Shunkō Kubo; and imagines himself as the story's protagonist. In it, he is traveling to his grandmother's funeral on a train with another man, who possessed a box containing the live head of a girl. In the main storyline, Kanako Yuzuki chooses classmate Yoriko Kusumoto to be her friend. Yoriko's mother, Kimie, believes Yoriko has been influenced by a mōryō, an evil spirit, when Yoriko begins taking nighttime strolls with Kanako. Kanako and Yoriko plan to go to Lake Sagami over summer break. On the night they leave, Yoriko witnesses Kanako crying, as well as a pimple on the back of her neck; both points perplex Yoriko. Soon after, Kanako is hit by the train on which detective Shutarō Kiba is traveling.

Sekiguchi reads more of "The Woman inside the Box," imagining himself as the protagonist. In it, he attends his grandmother's burial. Afterward, he continues to think about the girl in the box. In the main storyline, Kiba fails to get a coherent statement from Yoriko. Constable Fukumoto takes him and Yoriko to the hospital treating Kanako. Once there, Noriyuki Masuoka, Noritada Amemiya, and Yōko Yuzuki also arrive. Kiba and Fukumoto recognize Yōko as the former actress Kinuko Minami. After the hospital stabilizes Kanako, Yōko has her transferred to Kōshirō Mimasaka's hospital. Several days later, the discovery of a severed arm and two boxed, severed legs catches the attention of Morihiko Toriguchi, who travels with Atsuko Chūzenji and Sekiguchi to investigate. While driving around lost, they stumble upon Mimasaka's hospital.

Kiba thinks about the events of the last few days. In a non-linear flashback, Fukumoto escorts the transfer of Kanako to Mimasaka's hospital, a virtually-windowless box-like building in the middle of a forest. This facility is staffed by only two doctors, Mimasaka himself and Tarō Suzaki, as well as a maintenance engineer. Meanwhile, Kimie has become even more convinced that Yoriko is possessed. She brings Hyōei Terada to her house. He performs an exorcism of the house, and tells her that she can purify herself by giving him her tainted material wealth. Yoriko tells Kiba that Kanako was pushed by a man wearing gloves. Kanako disappears from the hospital, and Kiba later discovers Yōko with a ransom note in her hand.