In 1995, 5 serial murder cases took place. Ko Makimura took charge of the murder cases and tried to catch the serial killer. Due to the killer's trap, Ko Makimura's superior was killed. The serial murder case has been unsolved to this date.
22 years later, a murder memoir "Watashi ga Satsujinhan desu” ("I am a Murderer") is published. The author describes himself as the killer responsible for the 5 unsolved serial
