Moe Nishinosono interviews Shiki Magata, who secludes herself in the lab established by her parents on Himaka island, via video conference. At Sōhei Saikawa's office, Nishinosono meets Setsuko Gidō, w…

En route to the island, Yukihiro Yamane tells Saikawa and Nishinosono that Magata has not interacted with other people except via video conference for the 15 years since she murdered her parents. When…

Tomihiko Yuminaga declares Magata's death a murder, since her arms and legs have been amputated. With outside communication mysteriously cut off, the lab personnel wait for Shindō, who left to retriev…

The helicopter's radio has been smashed, apparently before Shindō could use it. Computer records show that no one accessed the roof between the time when Shindō and Miki arrived and when Shindō was fo…

In a flashback, Shindō tells Magata that his dream is to live a self-sufficient life in the mountains, equipped with only a knife. His widow Yumiko Shindō recalls for Saikawa and Nishinosono that the …

Saikawa and Nishinosono return to the campground the next morning and tell the group about the murders. In the evening, they return to the lab. Nishinosono notices upon reviewing the surveillance vide…

Ayako Shimada takes Nishinosono to the lab's entertainment center, where they spend time in isolation tanks. Meanwhile, Saikawa interviews Miki, but she has no idea why anyone would kill Magata or Shi…

Shimada checks the computer records and notices that someone named Michiru accessed the isolation tank system while she and Nishonosono were in the tanks. Shimada and Saikawa think someone may have pi…

The boat arrives the next morning, bringing the journalist, Setsuko Gidō, and allowing the seminar group to leave. The prefectural police also arrive. Saikawa and Nishonosono deduce that Magata entere…

Saikawa reveals that Nishinosono didn't interview Magata originally, but her daughter. Magata's original plan was for her daughter to kill her and Shindō, then take her place. Magata had also planned …

Magata visits Saikawa at the university. She says that she won't turn herself in, because she might not be sentenced to death. She also won't commit suicide, because she wants someone else to kill her…