After the fall of civilization as we know it, small colonies have formed around the world. Some are human, some are demon, some are reaper, and some are still unknown. These colonies do their best to stay well away from each other lest they start a war that brings about another apocalypse. The reapers do quite well at this, they seem to keep to themselves, only appearing when needed with a cool indifference about them. Demons and humans on the other hand almost enjoy causing problems for one another, much to the chagrin of most other species. The demon gate, rumored to have been created by reapers to cause peace, is all that separates the two. The gate prevents demons from crossing...but it does nothing to stop humans.