"I'm a demon in the upper ranks of hell, and my name is Yoru. I've been serving Satan for over 150 years after my death, and my favorite activity is to extend deals to helpless mortals like yourself. I'm pretty well known down there for taking care of my contracts, and if anyone were to go back on our deal... Well, they join me down there pretty soon enough. These deals help me to move up in the ranks, and give me additional power."