Shiro Nango, a student at Meisei High School, transferred from Kyushu to Tokyo solely to play baseball under Coach Gorou Ohyama, declining offers from more prestigious schools. He serves as the team's third baseman and is a renowned power hitter. Despite his quiet demeanor, Nango possesses a physically imposing presence.

He exhibits a strong protective instinct towards team manager Haruka Ohyama, Coach Ohyama's daughter, and vigilantly intimidates other students expressing romantic interest in her, though his precise motivations remain undefined. An unusual trait is his intense fear of insects, especially cockroaches, occasionally providing comedic moments.

His move to Tokyo and enrollment at Meisei are partially attributed to following Coach Ohyama, though some accounts suggest this may not fully explain his underlying reasons. His background prior to Meisei is unspecified. Nango's development focuses on integrating into the team dynamic and maintaining his role as a key power hitter, without documented major personal arcs or transformative changes. His portrayal remains consistent throughout the main series.