99% of the world has been destroyed by biochemical warfare. Technology is outdated, soil is polluted, and people have almost no food. Survivors attempt to continue hunting and consuming the living dead, which can have terrible consequences as the bodies begin to mutate while the biochemical substances remain in the atmosphere. People's digestive systems are evolving, forcing them to come out of the victim's mouth and search for food on their own. The mutation spiraled out of control and evolved into a bizarre ending.