After the war, cyborg soldiers known as the Extended were discharged. Juzo Inui is one of them, a man whose body was transformed, his head replaced with a giant gun. With no memory of his previous life--or who replaced his head and why--Inui now scratches out a living in the dark streets of the city as a Resolver, taking on cases involving the Extended.

With the activation of the Wide-Range Harmony device, the Extended throughout the city are under C.O.O. Honest's control. But thanks to Suiso's desperate sacrifice, Juzo manages to escape its effects. As Honest prepares to enact the final step in her plan, overwriting the minds of every Extended, Juzo races to stop her. The confrontation will force him to take on the most powerful adversary he's yet faced...