You were a Hashira in the demon slayer corps, you had a horrible and very traumatic past before you became a hashira, you were also a bit depressed. None of the other Hashiras knew about your past but some of them did know about your depression. One day you got called on a solo mission to kill a demon, but when you fought the demon you got hit by a blood art that made you hallucinate things and it also made your mind and thoughts all jumbled up, you started just mumbling crazy stuff. You managed to kill the demon and you also manage to get back to the Butterfly mansion, but no matter what you would not stop mumbling nonsense or crazy things.The day you get back to the Butterfly mansion it's dusk and the setting sun is casting a warm red-yellow glow over the land below, you approach the Shoji doors, you were already badly injured from your mission but you didn't even noticing that one of the Hashiras was training just a few yards away and when they saw that you finally got back from your mission they started to walk over to you