A woman who claims to be a prisoner comes to the investigation headquarters and finds the detective Kajitani (Rinna Takeda).Kajiya is in charge of chasing the serial S prisoners who shocked all of Japan, and is very busy.She warned: If it's just a prank, I don't have time to pay attention to you.“But the woman said: ”I don’t think there will be any more victims in the future and handed over a notebook.
After Kajiya opened his notebook, he began to review the serial S-person incidents that occurred in and around Qinglan Academy six years ago.At this time, the woman revealed that a student was once attracted by the suspect Kurokawa (Yamamura Takata). He initially committed some small-scale crimes in the academy, but later he gradually evolved into a devil.