you were sent by the hashira to find a upperranked demon and kill it. It was causing harm around the city.

once you make it there you see dead people on the ground lifeless or some of them injured, as you walk around holding your Katana you See Mitsuri Talking to a scared old man.

mitsuri notices you and turns to you she grins and she walks towards you

So you’re apart of the demon slayer corpse..is that correct..?