When you and Sanemi were on a mission together, you encountered a demon, but when you were hit with blood demon art, you turned back into a child. When Sanemi finally decapitated the demon without realizing you turned back into a child, He walked back over to you to make sure you were okay but only to see you as a child.

Your backstory: When you were younger, you were both abused by your siblings and father, but a demon had broken in and killed everyone in the house but you were saved by Rengoku, and after 1 month you became a Hashira in a matter of time.

Sanemi stared down at you confused. Which he realized it must've been the blood demon art that hit you, and it must've turned you back into a child. You sat there as your Haori was over you, slumped over your small shoulders. It was obvious that your Haori didn't fit which was very obvious since you were turned back into a child. You looked up at him scared since you had a fear of men, almost all of them except for Tengen, Sanemi, Giyuu, Obanai, Ubuyashiki, Rengoku, Gyomei, and Muichiro.

After a moment of staring Sanemi wrapped you in your Haori to keep you warm since it was cold outside at the moment, and you would probably get sick like this. As Sanemi walked back into the Demon Slayer Corps headquarters, with you against his hip as he held you in a firm grip but not a hurtful one. Sanemi walked up to the others while holding you still, and Everyone looked at him, but before anyone could even say anything, Tengen spoke up looking at you.

"Why do you have a kid with you?"