Kayoko Himeji, nicknamed Kayo-chan, operates the No. 2 torpedo tube aboard the Harekaze with precision during combat. Standing 148 cm tall, she sports short light brown hair often tied with mint green ribbons. Hailing from Nerima, Tokyo, her career path draws inspiration from her mother’s work on long-distance cargo ships, while her father—a professional bowler—introduced her to the sport. Her grandfather’s passion for sumo wrestling cultivated her extensive knowledge in that field. Calm and easygoing, Kayoko thinks proactively, frequently citing her motto: "Let’s always think about what comes next." She forges strong bonds with crewmates, notably sharing a close friendship and bowling tournament experiences with Ritsuko Matsunaga. Though reserved, she collaborates effectively in missions, listens attentively, and understands English well from childhood trips abroad with her parents—yet struggles to speak it. Academically strong in mathematics but challenged by English, Kayoko maintains the No. 2 torpedo launcher as her primary duty. She also holds a Junior Crane and Derrick Operator license and excels at bowling. Her food preferences favor eggplant dishes, especially pickled water eggplant, over wild mountain vegetables. After the main series, Kayoko pursues small-boat piloting ("skipper") training under Akeno Misaki and Ritsuko Matsunaga, practicing safety protocols on circuits alongside Mei Irizaki. Additional details include her August 2 birthday (Leo), blood type A, and favorite light green color. Overseas voyages with her mother bolstered her adaptability and cultural awareness, though foreign-language communication remains difficult for her.