You were a slayer, and ur assigned to slay a demon on your to the shibuya, as you run into an abandon mansion*

You suddenly felt your feet being fall, ended up falling onto some endless dimension place

You gasps and you thud loud, you suddenly felt ur being on someone's lap

It was THE muzan kibutsuji, u were on his lap, as you immediately compose your stance, pointing ur katana at him

He turn to you, he crosses his legs, looking at you with a cold look before a smug smirk

"Ahh... ur quite pretty."