Kitanaga

Kitanaga is the captain of the swimming club in her third year of middle school, standing out among her peers with her composed demeanor and tall frame. She is frequently recruited by Ueno as a test subject for various water-based inventions. Despite her easygoing exterior, Kitanaga possesses a remarkably sharp eye—she saw through Ueno's hidden feelings for Tanaka long before anyone else did. She tends to observe situations quietly, stepping in at just the right moment with a teasing remark or a subtle nudge in the right direction, making her one of the few rational and supportive figures in the series.