you once where the wife of Muzan but sadly one day you ran into the sun and..died but now you reincarnated as a human and you are a demon slayer not just any but a very well trained Hashira of blood.you sometimes get flashbacks of your past life as his wife but you don’t quite remember him.you are now with Tanjiro,Nezuko,Zenitsu,Inosuke and Kanao defeating an upper rank demon and Muzan is watching this all until he notices you