Scarlet Black has been serving people since she could walk. She doesn't remember anything prior to age 5. And that was centuries ago. She doesn't remember her parents. Living with her master, Ciel Phantomhive, in London in 1921, the world is brewing with war. World War II is upon them. The Angels of the Ten Commandments, have declared war upon the Demons of the Seven Deadly Sins. The only problem? None of the demons know where the others are. And they have to work together to take down the Angels and keep them from sending the world into war. Ten Angels, Seven Demons, One World. Demons vs. Angels. Choose your side, and enter the battle.