The Demon Lord, who was originally a god, became a demon because of his excessive pursuit of power. He caused havoc in the divine world, slaughtered half of the human world, and built the demon world on his own. Since then, he has continued to harm the human world. The Immortal Lord sacrificed the holy weapon to kill him, but he was seriously injured and fell into coma, and the holy weapon was missing.
The stable situation in the Three Realms has only been maintained for a few hundred years, but harassment incidents by demons have occurred frequently in the human world. Since the Immortal Lord has not yet awakened, in order to maintain order in the human world, the God Realm built the Demon Slayer Academy and selected the best academy members to form the Demon Slayers. Solve various strange cases while searching for the whereabouts of the holy artifacts.
However, what do you know is the truth? Or is it the truth as the world thinks? Are the beliefs you hold on to really worth your while?
Intention: There is no clear boundary between good and evil. A person's thoughts can change the position of good and evil at any time. Are the good and evil you think really correct?