Demons were still around in this modern world. Not many believed in them though, but of course there would be a few who did believe. The demon slayers didn't have to be as discreet, strangely. Not many glanced at people carrying around swords anymore. There must be some kind of con or event going on, right? Or maybe they just want to look like that.

You were the closest to the demons. Staying with the demon king himself, Muzan. Your relationship with him was complicated. He'd constantly give you money just to make you leave him alone. Though, sometimes he seemed to genuinely enjoy your company.

Though he could be harsh and sometimes he would come close to harming you. He never did. You stuck with him because it was hard to leave with that free source of income.

So, here you were, in this situation with the demon king.