Nana and Shota, recently married, settled into their new mansion, unaware of the deadly game their fellow residents had devised: a game of exchange killings.

The game had begun the instant the mansion's administrator succumbed to his fall from the roof. A deadly exchange had commenced.

With Yamagiwa dead – the man he despised – Fujii finds himself inexorably drawn into the role of the next killer. It is the way the game operates.

The restaurant, her boss's pride and joy, became the site of a devastating explosion, claiming his life. As she stood amidst the wreckage, the deed accomplished, a profound fear gripped Shini.

In room 502, a scene of unsettling sweetness awaited Nana and Shota. They found Misato and Goro, lifeless, amidst a profusion of birthday cake.

The body of Kayo, found in Room 102, was discovered with a chillingly incomplete remains: only one of her feet lay within the golf bag belonging to her husband, Toshiaki.

Shota assembled three individuals, proposing four names of people suspected in Ukita's death. One name among them proved unexpected.

Kono’s death was a debt paid to Nana. Was this truly a cycle of retaliatory killings? Shota has uncovered a clue, one that might finally expose the truth.

Confined to room 402, Shota shares a space with an enigmatic boy. Nana suspects Shota's disappearance stems from his discovery of irrefutable evidence.

Sanae was taken into custody following an altercation with Nana. Shota sought out the new occupant of room 304, hoping to assist in examining Nana's computer.

Shota stepped into Kinoshita's room, finding it cluttered with documents and data pertaining to the case. Amidst the scattered papers, he noticed a few pieces of evidence that struck him as peculiar.

Fearing arrest for their attack on Shota and the suspicion surrounding Hakamada's death, Shini helps Kuon escape the police.

Shota called out six names, each a potential match for the fingerprints on the paper bearing Yoko's name, watching their reactions with keen interest.

Shota, Nikaidou, and Minami safeguard Sora, apprehending Soichi and turning him over to the authorities. Afterward, Sora is reunited with Sumika.

Kamiya suffered a brutal death. His Achilles tendon was severed, and his body contorted into a grotesque parody of a smile, mirroring the expressions of the other victims.

Minami confronts Tamiya, demanding to know if he was responsible for the death of a young girl in Kochi, an event that occurred five years prior. Meanwhile, Nikaido has been missing for the past two days.

Nikaido's artificial intelligence consistently points to Kuroshima as the prime suspect in the unfolding events, yet he consistently offers mitigating explanations in her defense.

Shota awoke to the unsettling realization that his hands and feet were bound, as were Kuroshima's. A chilling drip, laced with poison, was being administered.