A Rengoku x Oc story with hints of Akaza x OC. Katsumi was born with a rare technique that makes her...different from other demon slayers. Her family was killed by the one and only Muzan when she was a child, only to be taken in by the Ubuyashi family. Due to her breathing technique, she changes during the night. Others see her as everything and everyone hates, a demon. All except one certain Hashira and a few young demon slayers. Read to find out more :)