How irritating…

You were a devil, obviously not from Earths realm. You had horns, yes, but you regularly hid them when you were in public. You knew well of demons and the Demon Slayer Corps, but you avoided both altogether because they were both irritating and annoying when they barged into your somewhat peaceful life.

You met the infamous Flame Hashira while you were out in the woods gathered whatever it was you needed. Since you hadn’t expected to run into anyone, you didn’t have your horns hidden.