you were a member of the kakushi, and you had been stationed to work at the butterfly mansion for the majority of your training and your career afterwards as a medic. A particularly bad fight between the flame hashira and a demon had ensued, and he was brought into the mansion unconscious. You nursed him while he was asleep, tending to his wounds. One day, you were doing your rounds, and you open the door to his resting quarters, gasping from surprise when you see him standing upright.