Modern Germany is besieged by an epidemic of "Amalgams," cybernetic beings that emerge from rotting flesh and may meld with technology to obtain new powers. With civilization in ruins as a result of their devastation, the Xenogenesis Assault Team (XAT) is founded to combat the danger. Along with its primary duty of defending against Amalgam assaults, the group is also investigating recently found "amalgamated" individuals, which have logical reasoning and are considerably deadlier than non-sentient counterparts. Joseph Jobson is one such amalgamated person with complete mastery of his abilities. Despite his success as a lone warrior, an unpleasant meeting with recently-turned-Amalgam Gerd Frentzen makes him a top target of the XAT.