The Devils Game

Lucy McLane is a girl you would overlook normaly. She is, what you would call, a wall-flower.

Lucy lifes in a normal world, quit simelar to yours. The only differents are the Devils Games. Here are humans fighting other humans. But insteat of wepons they use the Devils creatures. Of course its illegal.

Of course, Lucy gets involvet with these games and end up having one of those creatures at home.
She signed a contract with him and is now stuck with a devilish demon. He on the other side is enjoying toying with someone who doesn't know anything about demons and uses her for his own good.