Saki Nagatsuka joined the girls' basketball club reluctantly, spurred only by her friend Maho Misawa's insistence and the offer of a custom-made eye-guard to accommodate her glasses. Known for her reserved and rational demeanor, she earned the nickname "Ice Age" from Touko Hatano, contrasting with her other moniker, "Speed Queen." As the composed sixth-grade class president of Keishin Academy's Class 6-C, she acted as the basketball team's stabilizing force, frequently tempering Maho's impulsiveness and mediating disputes between Maho and Natsuhi Takenaka to preserve team unity. Her family runs an okonomiyaki restaurant where she regularly serves as the "Kanban girl," promoting the business and managing orders. This role fostered a serious, practical approach to cooking okonomiyaki, making her notably assertive about its quality. Despite her typically level-headed personality, Saki occasionally displayed tsundere traits, struggling to openly express her desire for praise from coach Subaru Hasegawa. On the court, she initially played shooting guard but transitioned to point guard, leveraging her exceptional decision-making and analytical skills. This shift freed teammate Tomoka Minato to focus on offense and proved vital during the Suzuridani match, where her strategic adjustments countered the opponent's defense. Her journey evolved from a hesitant beginner to a dedicated player who recognized teamwork's value and actively sought to improve her skills, though she initially lacked confidence and needed others' encouragement. An OVA depicted her reading yaoi manga, presented as a parodic or satirical element. Saki stands 148 cm tall with light blue hair usually in braids and violet eyes. She wore her custom eye-guard during games and often played with her hair down. Her birthday is July 1, and she has blood type O.