The Tokyo Police Corporation is at war with the "engineers"--genetically modified super-criminals can bio-fuse their open wounds with weapons. Ruka, the top engineer hunter, must cut through the psychotic engineers to track down her father’s killer. In the near future, the Tokyo Police Corporation is locked in a bloody war with the "engineers." These genetically modified super-criminals can bio-fuse their open wounds with weapons, turning self-mutilation into a combat form. Ruka, the daughter of the police chief’s murdered right-hand man, is now the top engineer hunter. With cold-blooded efficiency she cuts through the psychotic engineers and tracks down their home base, a truly bizarre fetish club. Nothing keeps her from her sworn duty, even when she finds out the truth behind her father’s death.