Modern Germany is suffering from an outbreak of "Amalgams." These cybernetic entities exist only to cause chaos, emerging from decaying flesh and capable of merging with technology to acquire new abilities. With society reeling from their devastation, the Xenogenesis Assault Team (XAT) is established to contain the threat. In addition to its main objective of defending against Amalgam attacks, the organization is also studying newly discovered "amalgamated" humans who exhibit rational thought and prove far more lethal than their non-sentient counterparts. Joseph Jobson is one such amalgamated human who maintains complete control over his powers. Despite his success as a lone warrior, an unfortunate meeting with Gerd Frentzen, who has recently become an Amalgam, makes him a high-priority target for the XAT. As he evades the organization and searches for new allies, Joseph transforms into the Blassreiter—a being proclaimed as the strongest Amalgam in existence. Now, he must use his new powers to fight back and reveal the truth behind not only his own past but also the entire Amalgam conflict.