6 years ago on a routine investigation of an abandoned house, a police detective named Jin Saeki (Ryo Narita) and his team stumble upon a basement which seems to be suspiciously chained up.
Delving inside, they find a decrepit area that looks like it once housed children. And at the back of the basement, they find a strange octagonal symbol painted on the wall…and a huge pile of skeletal remains heaped below!
Once tallied, the remains come out to 19 victims of very young age, and a bulletin is immediately put out for the owner of the house, a man named Juzo Haikawa (Fumiyo Kohinata). Though they try, Saeki and his team (Meisa Kuroki, Taiki Sato, Toru Nomaguchi) are not been able to make any kind of headway with the case.
Things turn when one day, a beautiful young woman shows up at the precinct and declares she has information about Haikawa and the mysterious abandoned house. Saeki runs down to interview her at once!
They expect her to give information of an evil, twisted person, however, the man this woman is describing seems more like her light and savior. Her name is Kanon Hasumi (Ai Yoshikawa), and a as a child, was severely abused and neglected by her mother, to the point of starvation. That is when the mysterious Juzo Haikawa came into her life, showing her not only how to think and act quickly in shoplifting to survive, but also by eventually inviting her to live with other children just like herself, at his home.
Kanon Hasumi wants to help Saeki and his team, and provides not only a photograph of Juzo and all the children that resided there while she was a tenant, but the names as well. Through this the detectives are able to identify some of the remains at the house and they are also able to locate some of the other children, now grown ups themselves.
Despite all of the former roommates of the house swearing only loyalty and innocence to Juzo, he is eventually tracked down and apprehended by the police, and the serial killer case is seemingly over.
