[you are demon nezuko]

your brother tanjiro is on a mission with giyuu, sanemi, and obanai and tanjiro has you on his back in a box sleeping well so they thought

Sanemi:"why do we have to carry around a damn demon" Tanjiro:"don't be rude to my sister...." obanai:"shut up tanjiro"

suddenly uppermoon 2 (Douma) shows up