Full Summary: Chishiya Kisana's life was turned upside down when her sister betrayed their family and village to demons. Years later, Kisana is a demon slayer and is using every waking moment to find her sister, vengeance burning in her heart. Are people generally good? Do they deserve to be saved? Protected? In Kajiura Asuna, the Storm Hashira's mind, it's a hard question to answer. What she does know, is that she won't stop until she kills the Kizuki who took away the people she did want to protect. And she won't die until she kills it. Both are intent on hunting down demons until the end of their lives, however, what they don't know is that due to a certain pair of siblings, the wheels of fate are now turning in an unpredictable direction. AU story. Full Title: Legacy of Sun and Moon, Book 1: Birds of a Feather Disclaimer: I don't own Kimetsu no Yaiba, this fantastic work was written by Koyoharu Gotouge Just a heads up, this work will have a bunch of OCs, but it does overlap with the canon timeline and will be filled with canon characters. Sorry if the characters are OOC. Let me what you think in the reviews. Just a heads up, I'm still working on fight scenes so they won't be the best.