Kiyoko Shimizu served as the sole manager for Karasuno High's boys' volleyball team during her third year. Before Karasuno, she competed in middle school track and field, specializing in hurdles. Recurring leg injuries from this time etched scars, leading her to constantly wear black tights in all seasons for concealment. The track team's size and her communication struggles hindered close relationships with teammates, culminating in her retirement for undisclosed reasons. Recruited by Daichi Sawamura upon entering high school, she became the volleyball team's manager. Without prior volleyball knowledge, she independently mastered the rules, regulations, and referee signals to perform her duties effectively. Physically, she stood above average at 166.2 cm, with shoulder-length black hair, grey eyes, a distinct beauty mark on her chin, and thin-framed glasses featuring pink rims. Her appearance frequently drew attention from rival schools, earning Karasuno the reputation of having a "beautiful manager." Reserved and initially aloof, she approached her managerial work with seriousness and meticulousness. Despite her quiet nature, she demonstrated profound care for the team, notably repairing and washing Karasuno's old "fly" banner to bolster morale before a critical match. Though she struggled with public speaking, she pushed herself to verbally encourage the team with phrases like "do your best," deeply moving the players. Her personal development accelerated after recruiting Hitoka Yachi as an assistant manager. This mentorship role helped her open up emotionally; she smiled more often, made jokes to ease Yachi's anxiety, and became more conversational. Her managerial contributions extended beyond routine tasks. She co-created a detailed scouting report on Shiratorizawa Academy with Yachi for the Spring High Preliminaries, greatly valued by the team. She also inspired fundraising initiatives for the Tokyo training camp and mentored Yachi, sharing her philosophy that trying new things requires curiosity rather than unwavering commitment. Her athletic background occasionally surfaced, like when she instinctively deflected a stray ball to protect Yachi during a match. In relationships, she typically ignored admirers like Tanaka and Nishinoya, though she scolded them when necessary. Her bond with Yachi grew strong, with both sharing personal stories, including Kiyoko's past insecurities about her scars. Post-graduation, she married Ryūnosuke Tanaka, changed her surname to Tanaka, and began working at a sports shop. Her appearance evolved, featuring chin-length hair and the absence of glasses or leggings. Memorable quotes include her reflection on non-playing roles: "I may not stand on the court... I may not wear the uniform... But, right now, at this very moment... I stand with them on the front line of the battlefield."