The Tokyo skyline was forever changed when several years ago the mysterious Hell's Gate appeared. Just as stars disappeared from the skies, false stars materialized coinciding with the new emergence of psychic abilities among a select minority of people, known as Contractors. The Contractors have become spies and assasins for various clandestine factions with unknown agendas. One contractor, codename "Black", employed by an independent syndicate, is commited to stopping his fellow contractors; exposing the conspiracy that his past forces him to be a part of.