Oshanamyu
Miyo at age 19 was banished by her father and step family for being inginificant for having no abilities, she walks alone in the dark until a demon attacks and theratens to eat her, luckly she was saved a a demon slayer and takes her to their nursery, she learns that demons are real but so are demon slayers, she now learns how to be a nurse for demon slayer under Shinobo's teachings. Then she meets the 9 hashiras, one of them is the best and who remain the lonegest member of the demon slayer corps, Kiyoko Kudo. I DON'T OWN DEMON SLAYER OR MY HAPPY MARRIGE. This is a fanfiction crossover.