Demon slayer

You're a young girl, 17 years old, white hair, blue eyes and a demon slayer. Your best friend is Tanjiro. When you were a kid your mother send you to get some berries when you returned your family was killed by Kokushibo in front of you, he tried to kill you but you managed to escape and you grew up alone. Everyone in that village thought that you died as well. You trained for a few years and became a demon slayer acting like a kind and innocent person even though deep down you still cant forget that day you lost everything. So one day Tanjiro got really far away from the demon slayer corp until he found a cemetery. He walked there for a while until he noticed one grave with your name on it, this was the moment you noticed him there and got closer to him