2017.In Haikawa Shisan's home, the bodies of 13 children who were locked in the basement and starved to death were found.Haikawa abducted 19 children in the past and lived with them.

In addition to the 13 victims of the incident, six people including detective Saiki Hitoshi's younger brother Takimoto Sosuke and Rensui Kanon survived.Except for Kenryu Kamishiro, whose whereabouts are unknown, everyone denies Haikawa's crime.

However, the suspect Haikawa was arrested later.The characteristic hexagonal mark left over from the scene was painted on that hand...!?

At this moment, Hanayin was pushed down the stairs.Saaki rushed to the hospital, and Kanon told him that the prisoner who pushed me down was the prisoner in the Haigawa Residence incident.Then, in order to find “new prisoner”, request to continue the search.

7 years later in 2024.Reporter Touko Mori, who is looking for the missing runaway girl Mirai, asks Saegi about the “RICK” sign left at the scene of the Haigawa Residence incident.

Mori revealed that Mi Lai also had a tattoo with the same symbol on her body, “Has the incident really ended? ”asked this——.