In 2013, the criminals of a huge serial murder case that had been hidden for 13 years committed another crime, and the police station was overwhelmed. At the same time, a new serial killer high school student starts his first case. For a moment, only the panicked residents and twisted onlookers remained. However, under heavy media exposure and surrounded by the police, two extremely dangerous figures began a unique meeting in history. Crime escalated further. Will they become good friends? Or...?