Centuries ago, there were three distinct plains of existance:Asgard, land of angels, Utgard, land of demons, and Riviera, land of humans. But this distinction was shattered by the two great wars.
The war known as Ragnarok was long and hard-fought between Asgard and Utgard. In the end, the angels of Asgard were victorious. The land known as Utgard became a barren wasteland, unable to support any form of life, even the demons who were able live with far less than humans and angels. The angels granted mercy and did not annihilate those demons that survived the war, but with no way of surviving in the wastelands of Utgard, they found themselves with no other option for surivival but to migrate to the land of Riviera, merging their kind with the humans. It was a co-existance that at times were both peaceful and hostile. Eventually, after many centuries, demon-kind rose up as the powerful lords of Riviera. The rights of humans varied depending upon the the ruling of the Demon Lord of the region. The rare benevolent lord treated the humans in his land no different from his demon subjects, but the vast majority viewed them as below them:at best, they were second class citizens. At worst, they were fodder, in every imaginable sense of the word. The angels of Asgard did nothing to aid the humans, content in the fact that Asgard was still safe from the corruption of the demons. This would inevitably lead to their downfall.
Nearly a millennium after the great war of Ragnarok, the second great war, which historians would later dub Retribution, was incited. The angels were set in their believe that the demons would never dare to attempt war again, and so were caught unprepared when they did just that. The war lasted ten years, nothing compared to the two centuries of Ragnaraok. Because the angels had been caught off guard and unprepared, they eventually were defeated. The demons did not kill those who survived, but not out of mercy as the angels had done in Ragnarok. Those angels who survived were dragged to Riviera, where they became little more than slaves to the Demon Lords and other high-ranking demons. Pets.
Only one world now existed, on where demons reigned over the helpless humans and defiled angels. All hope seemed lost.
But one day, nearly twenty years after Retribution had passed, hope may blossom anew. When a demon prince is given an angelice slave by his brother, the balance of the world as all knew it may shift forever.