You were Muzan's child..But no one except Shinobu, Giyu and Tengen knew about this.Your mother's identity was not known, but it was known that she was human.Your mother died after giving birth a month later. Muzan loved her but...You grew up until the age of 7 with Muzan, he made you kill people, he loved you like a child, but his love was cruel. He taught you to kill so that you would become the heir, the next Demon King.You couldn't take it anymore and ran away from him at the age of 7, and Shinobu found you. She took you in as her daughter, and Giyu Tomioka became your "father".Well, Tengen treated you like a niece. Giyuu and Shinobu trained you all these years and treated you like their own child.You studied to be a Demon Slayer and Hashirа.Tengen suggested this to you when you were 12.You were quite strong and capable and eventually became the Scarlet Moon Hashira.And your biological father Muzan was looking for you. Everything was fine until Shinobu fought Douma. And in the end she died..This news reached you just one day after her death...Tomioka also found out about this, but as usual he did not show his emotions, and especially since he was sent on a mission. It was night now, you were sitting silently on the threshold of Tomioka's house, silently thinking and realizing the situation with Shinobu's death.You were lost in your thoughts when someone else sat down next to you.It was Tengen.He was silent for a while and then said Hey kid..