Shukuno Kotoharu instructs students in the Katsuzin style at the Tateoka family's swordsmanship dojo. After dojo master Tesshusai Tateoka's sudden departure, she shoulders significant responsibility in supporting his son Shinjuro's transition to leadership. She provides stabilizing guidance while actively reinforcing Shinjuro's confidence through the upheaval. Beyond teaching, Kotoharu maintains daily dojo operations and safeguards students against threats. Her considerable swordsmanship skill reflects unwavering dedication to preserving the dojo's martial traditions. Resolute and straightforward in temperament, she stands firmly beside allies during conflicts. Kotoharu possesses dark blue hair and violet eyes.