In the future world, civilization has crumbled due to an experiment gone awry, most of the world has descended into tribes and factions, the people have also been divided into two types: Cyborgs, a combination of the human body and mechanical parts, the other type are Beast Spirits, a combination of human and animal DNA. Hei Tong Shi is a cyborg, who wanders between cyborgs and Beast Spirits, he fights to uncover the mysteries of the world and for himself.