In this anime, a nameless hero in command of a secret human weapon arises from the ashes of the fallen Jushin empire to defend the people from zombies, cannibals and beasts at the command of the evil dictator who destroyed their master. The lone remnant from a forgotten warrior class, he is the last of the legendary Amen Osa, the Phantom Masters of Jushin. To avenge his lost world, he intends to wield his human blade of justice.