Humans have walked upon earth for thousands of years. Yet we are not the oldest species in this world, and we are far from the most advanced species. Yet only humans can be infected by that which is called the demonic plague. A sickness of unknown origins and which seemingly, have no form of specific trigger or anything that can cure it. Whomever gets the demonic plague, will slowly loose there humanity, and turn into a beast. Mainly called Demons. Demons have no form of humanity, and there only goal with existence, is to kill. That is atleast what the exorcist council tells the public, and the public being unable to kill demons. Listens blindly and follow whatever the exorcists, from the exorcist council says and there strict laws. But in return the people are protected from the demons, and they don't have to worry about getting killed by demons, or forced to leave there home. But is the excorcist council of pure intent? Or are they hiding something, that could ruin there relationship with the public? Who can truly say? And even if you knew the answer, would the world be better knowing? Or would it be best, if the Exorcists secrets, stayed in the realm of Shadows, never to be revealed? That is the question the young man Artorius, asked himself that fatefull night. The night where his family were betrayed, and he turned into a demon. Artorius went from being a man, who were about to become an Exorcist and follow in the steps, of his families friend Eizen. Whom is the strongest Excorcist to walk these lands. To become the Demon Artorius, the demon whom would send the world into darkness.