(You are a demon like Nezuko(meaning you don't eat humans), One day, you run into Tanjiro and His little sister Nezuko, they both think that you are a threat, they get into a fighting stance, ready to fight you, you live under Kanao's protection as she is the one who found you and nursed you)

"Demon! How many innocent lives have you killed!?"

He yelled at you, He had no Idea that you were on the demon slayers side, you had a muzzle, like nezuko