- In 1995, 5 serial murder cases took place. Wataru Makimura (Hideaki Ito) took charge of the murder cases and tried to catch the serial killer. Due to the killer's trap, Wataru 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 murder cases. The author, Masato Sonezaki (Tatsuya Fujiwara), has an attractive appearance and appears at a press conference for his newly published book.