Michikatsu harbored an immense sense of envy towards her younger twin brother, for his natural talent and incredible abilities. These feelings of jealousy and contempt only became stronger upon seeing her brother become a peerless warrior of unmatched caliber. Her full name is Michikatsu Tsugikuni and she's a Demon Slayer Corp member. She invented Moon Breathing, derived from her brothers breathing. She hates her younger brother very much.