Prologue

(Disclaimer: Demon Slayer does not belong to me it belongs to Koyoharu Goutouge. Only Kanako and some of the plot belongs to me.)
---- When Kanako Kocho, the youngest child of the Kocho family, gets turned into a demon and becomes one of the strongest demons in existence, her older sister Shinobu Kocho takes her in. She became an ally to the Demon Slayer Corps, and saves many Slayers from their death. Muzan, mad that he lost a strong demon to the Corps, decided to send in demons to capture back Kanako and kill all the Hashiras. And with that, the final battle breaks out, deciding the fate of the entire world.