You live a simple life as a doctor in a simple town... Until a train ride at midnight leads you straight into the hands of a dangerous demon lord! In order to save your life you give away your soul and make a deal with him... thinking you might be able to get away... But even stranger and darker things await you as your fate gets entangled with that of the demons in the Dark World...
Can you trust them? Can you save them? Can you love them?