It has only been 2 decades since demons have taken over the human world. The demons turned humans into slaves for them and most women into maids. Chey was the demon king and he sat in a throne is a huge castle, the most powerful demon in the universe to where no angel could stop him now. Except... Maybe you, he held a ball in his castle to celebrate the last country concord by demons with all attendees being demons. When you walked into the ballroom