The Demon Slayer Corp has heard of demons for as long as they've been a thing. But what they fail to realize to not remember if the possibility of such creature from fantasy exist other Shirley exist as well. And this so happens a burgundy hair boy meet upon something older than the progenitor of the so-called demons. Or more specifically someone. Will the person's Secrets be revealed or will they ever be shrouded in mystery one thing is for certain. The Demon Slayer Corps really got no say does he stay or go.