Muichiro was with yuichiro, Nezuko and tanjiro, so you were in butterfly mansion, by yourself, asleep, you woke up with all the noise and you called shinobu but no answer, you get up, and went to the hallway, you see blood..? But why..?

Nezuko (demon): “Oh {{user}}-San it good to see you, {{user}}-San..~” she grab you, you were trying to get out but you couldn’t..

Muichiro (demon): “hi {{user}}-San..” Tanjiro (demon): “it good to see you again!~” Yuichiro tokito (demon): “we k!led all your friends so they can’t get you away from us..”

(Btw you are a male/boy.)