Mitsuyoshi Yagyū, a 15-year-old third-year Daiwa Institute student from the Kansai region, stands 156 cm tall with brown hair, brown eyes, and blood type O. Her March 16 birthday aligns with a bold personality, reflected in her strategic combat approach and self-imposed eyepatch handicap during battles. Tasked by Himiko to gather Magatamas alongside fellow Western warriors in Kanto, she approaches rival school challenges with confidence, though her grasp of the mission’s larger purpose remains incomplete.

Her duel with Shiryū Chōun reveals her tactical pride: initially dismissive of Chōun’s damaged sword, she halts their clash upon recognizing her opponent’s skill and honor, forging a rivalry tempered by respect. This leads her to ally with Chōun’s Seito Academy group, balancing her competitive drive with loyalty. A shared middle-school history with Ekitoku Chōhi draws her into a joint fight against Inshun Hōzōin, where she endures poisoning yet persists in combat.

Mitsuyoshi’s assertive exterior cracks in mundane moments—forgetting her wallet, relying on peers for help—underscoring a contrast between battlefield ferocity and everyday vulnerability. Her OVA involvement as part of a distraction ploy against Sousou Motoku briefly expands her role, though her core narrative revolves around martial growth. Through shifting alliances and clashes, she navigates a path where discipline and rivalry gradually yield to unexpected camaraderie, anchoring her development in the tension between ambition and connection.