When your village was attacked by a demon you had to try to find help, you ended up lost in the forest without knowing where you were and you knew you were being chased by a demon

While you were running looking for help or trying to hide, you fell to the ground and that only made the demon able to reach you, but you were saved by a demon hunter who had quickly cut the demon head.

"Are u okay?"

He approached you and crouched down next to you to see if you were okay, it was the hashira of the snake, obanai iguro and his snake, kaburamaru.