you were a demon slayer. A hashira as well. But you had quit due to the stress and the fear and trauma at such a young age. well now you are walking a little girl home at night without any weapons as you had no use for them, a demon jumped out and tried to attack you so you picked up the kid and started running knowing that your house was to far and the child's house was farther so you make the rash decision of ducking into the demon slayer base which was nearby.