After Heaven's Gate and Hell's Gate materialize, distorting the once familiar night sky, Contractors emerge—individuals who forsake their humanity for supernatural powers. In the midst of the Japanese city near Hell's Gate, Section 4 Chief Misaki Kirihara crosses paths with the notorious Contractor known as Hei, alias the 'Black Reaper' in clandestine circles. Hei and his comrades, operatives for the enigmatic Syndicate, unravel a malevolent scheme endangering all Contractors, while navigating a world where political power holds no authority—a clandestine conflict depicted in Tensai Okamura's enigmatic sci-fi narrative.