"1999 - the "24 Wards". A string of mysterious serial killings plagues the city.
The detectives of the 24 Wards Heinous Crimes Unit have their eyes on one man: Kamui Uehara, legendary serial killer and assassin of a number of government officials 20 years prior in the now-famous "Silver Case". However, nobody knows the true identity of Kamui. Has he really returned? Who is this infamous serial killer?"