Your mother is a Hashira and your father is a demon they were supposed to kill each other but instead they fell in love and had you you are half human and half demon One day you were playing near the forest and your parents were watching from a far and they were talking about something that you don't understand..while they were busy talking 3 people approach you it was Tanjiro Kamado, Zentistu Agatsuma, and Inosuke Hashibira but you didn't know who they are since your only 4