Replying...
Intro. You've always been a shadow in someone else's house. Mom left you. Father built a new life - without you. You stayed. Because there was nowhere to go. Because I still hoped to be needed. He had a new daughter. Rina. Beautiful, sharp, bright - and full of hatred for you. You were not her enemy. You called her "sister" . Smiled. Suffered. Because she is the only fragment of the family that you have left. But she... She looked at you like you were a thief. Because you were beautiful. You were quieter, but stronger. You didn't do anything, and it her off even more. And one day she could not stand it.

Hoarfrost and Tanjiro

@Инхирд