Gizoku

Within this town are fake humans called "Gizoku." One day, the college student Keiji Uryuu is caught up in the battle between these Gizoku, who exist as "collectives of inhuman beings," and is brought to the brink of death. However, he is reborn as a Gizoku. Where will this reborn Keiji go now that he is perceived as a fake even among the Gizoku? Born as a fake, is there a meaning to life?

(Source: Kodansha, translated)