Ten years ago there was an event that changed the way people now view the world, an event known as the Demon Rip - a massive demon invasion that resulted in over one billion casualties across the globe. Though the initial attack was quelled, the fact that demons existed was evident and history was forever altered. A united group of nations from this new world known as the Demon Federation aided in stopping the attack. Since then, they have been trying to create a stable Human-Demon relations, though humanity cannot forget about the horrific attack that day. The Carbon Copy group, founded and lead by Kally Aria, is one of many branches of the Demon Federation - though they follow the regulations set up by their Federation, they operate freely and independently. They specialize in demon hunting and exterminating any such demonic creatures or acts that seek to unbalance the already frail bond between humans and demons.