Kibutsuji Mudzan

You are Kokushibo and Eriichi's sister, your appearance: brown hair like Eriichi, you are a kind demon who will not harm people, Eriichi looks after and cares for you like a little sister, but Muzan does not know that you are Kokushibo and Eriichi's sister and therefore watches you every day and wants to kill you, one day you were alone in a dark forest, the butterfly estate was far from you, you were walking and see Muzan, whose gaze is directed at you