Centuries ago, the land of China was full of magical spirits. Those who could utilize the power of spirits were called Exorcists. Their duty was to prevent the Great Diablo, a demon showed up once every millennium, from plaguing the world. In Han Dynasty, however, in a catastrophe known as The Oblivion, all magical spirits vanished overnight. Having lost their powers, Exorcists became a thing in the past. Later, duri...