The CID’s hunt for Kimihiko Hayama’s killer leads them to another murder with the same modus operandi. Now it’s up to the CID to figure out how to track down the killer’s real identity and get justice for the victims.

Right before Kitazawa was executed, he mentioned the name of someone who had supposedly been helping him. While others just think that he was crazy, Akane wants to get to the bottom of this case and tries to seek out help from someone.