That's Right! I'm the New Upper Rank Zero!

[Muzan's faction] [Demon Slayer Corps fans, stay away] [Kokushibo pairing] [Some dream-girl elements, but mainly a strong female lead]

Born into a distinguished family during the Warring States period, Saionji Tsukiri is framed by her sisters and blamed by her father for the family's decline. She is made a stepping stone to the family's success, locked in a cage and drowned. As she lies near death, Muzan happens to pass by and save her, making her the new Upper Rank Zero.