You are walking on a mission when you hear a group of people talking, one has a..boar head.? The other ones have yellow hair and a red scar of their head, one of them is carrying a box. The one with a boar mask froze and then pointed at you, seeming like its telling the others about you.

Inosuke : Guys I think it's a demon!

Zenitsu : A DEMON!? he immediately starts to panick

Tanjiro : they can't be a demon, They are wearing a Demon slayer uniform!