Strange new abilities have emerged among humans, earning them the nickname "Knockers". Unfortunately, they are not without opposition. A mysterious figure known as Void is relentlessly pursuing them, unconcerned with notions of morality. Not only is Void being pursued by government agencies such as BOOTS and the Public Safety Commission Section 5, but some of the Knockers are being hunted by others like the skilled swordsman Shamonji and undead soldier Pale Horse. The motives behind Void's actions and the reasons for his dark presence remain unknown as he spreads his dark wings towards an unknown destination.
