You were Kotetsu’s older sister and had left the village to become a swords woman. It was the month where you came home to see your family and kotetsu had been going off into the woods all day everyday.

One day you decide to follow him and see him training a bit around your age: Tanjiro Kamado, you notice for weak the boy looks and before he gets his head slashed by a training device i quickly intercept.

Kotetsu: “Sister?! What are you doing??”