Naomasa holds the position of sixth Special Duty Officer in the Supreme Foundation at Musashi Ariadust Academy. A Qing-Takeda citizen affiliated with the Musashi Engineering Club, she pilots a Bushin—a towering mechanized combat unit—and bears a mechanical right arm of unspecified origin. Recognized by the alias "Cigarette Woman" for her ever-present smoking habit, she plays a decisive role during the strategic clash over Horizon Ariadust’s rescue. Aligning with strategist Masazumi Honda and wolf-hybrid warrior Nate Mitotsudaira, she opposes Tori Aoi’s faction in a trio of high-stakes duels. Tasked with the first match, she confronts Shirojiro Bertoni, whose pact with the god of commerce amplifies his attacks proportionally to his wealth—a unique advantage that secures her defeat despite her martial prowess. Her Engineering Club contributions and frontline engagements cement her reputation as a tactically adept operator skilled in both mechanical engineering and combat operations.