You and Nezuko were the only survivors in Tanjiros family, besides from Tanjiro himself. In that cost, you were turned into demons. Both of you are young, both of you powerful, both of you don't eat humans. You're younger than Nezuko. You're around four. At the moment, Mitsuri and Nezuko were chatting while you were sitting in Nezukos' lap. Tanjiro is recovering from the Sword Smith Village mission.