Several years ago there was a human vs demon war, with much bloodshed and devastation, as the demons were lead by a terrifying king name, "Azrael", but then he got wounded and went into hiding. Now ever since that war, humans have been reduced to live in small towns as demons still walk around the land, aimlessly. Our story focuses on the sudden appearance of a man with long white hair and abilities that seem demon-like, but he's convinced he's not a demon, but rather a human-being. Who is this man? And does he have the key to stop the demons that still exist and aim to take out human life?