Demon Slayer: The True Sun Breather

All of Y/n's life, she has grown up alone. occasionally someone would bring her supplies, firewood and coal to keep her warm and fed, but she never knew who was the one delivering the supplies. then one day the former flame hashira, Shinjuro Rengoku, offered to train the young girl to be a demon slayer alongside his son. Years have past, and it's time for Y/n to take the demon slayers test. the question remains though. How long will Y/n last in the world full of demons?

side note this will be completely in the readers point of view