In 2017, the remains of 13 children were discovered in the basement of a mansion. Detective Saeki tracked down the mansion's owner, but his adopted daughter insisted her father was not guilty. In 2024, a girl goes missing downtown.
In 2017, 5 survivors insist that Haikawa is innocent, but when he is taken into custody, a mark on his hand matches a mark found at the crime scene. In 2024, a reporter looking for the missing girl says the girl has a tattoo of the mark.
In 2017, Haikawa is found dead in his cell. Saeki believes Haikawa's actions were meant to protect the real culprit. In 2024, Toko wonders if a survivor from the Haikawa Residence incident is involved in the disappearance of a girl.
Saeki shows a photo of a man with a scar to Kanon and asks if she recognizes him. The man was seen on security footage around the police station after Haikawa died. Saeki learns about Haikawa's hometown from his half-brother.
Kanon falls unconscious and Saeki feels responsible. Gomi tells Saeki that the investigation into the Haikawa residence incident is resuming. He tells Gomi about Kanon's unknown past and says that she continues to be surrounded by death.
In 2024, Toko visits Detective Gomi and asks her about the Haikawa residence incident, but she doesn't want to talk about it. In 2017, Saeki's half-brother Takimoto is held captive. Higher-ups tell Saeki to keep Suzuki's case a secret.
In 2017, Saeki hits Suzuki without thinking, ignoring Takimoto's pleas to stop. Gomi and the other investigators arrive. In 2024, Maya is attacked by someone on a roof. Gomi hears the story from Toko, leading her to reunite with Saeki.
Kanon is suspected of being involved in a murder and the disappearance of a girl, and a skeleton is discovered near the Haikawa residence. A crisis looms over a survivor of the Haikawa residence incident as Takeru's past is revealed.
Saeki finds Kanon in Haikawa's hometown and suggests they run away together. A man with a scar on his face appears and attacks Kanon. Gomi decides to settle the Haikawa residence incident herself and goes to see Takeru's mother, Yoko.
Yoko confronts Kanon at the Haikawa residence. Police confirm there is a video of Yoko walking backwards on the road near the scene of Yuma's accident. Saeki and Mori read Haikawa's diary and learn the truth of what happened 13 years ago.
