Shiro Nangou, a quiet yet physically imposing third baseman and power hitter, relocated from Kyushu to Tokyo solely to attend Meisei High School. He chose to play baseball under Coach Gorou, deliberately turning down invitations from more prestigious baseball programs.

His attention centers intensely on baseball team manager Haruka Ohyama. He displays protective behavior toward her, aiming to intimidate any male students showing interest, revealing a strong, unspoken concern for her well-being.

Despite his formidable presence, he possesses a notable fear of insects, particularly cockroaches, which sends him into visible distress. Among rhythmic gymnasts and those close to Haruka, he is commonly known by the nickname "Nan-chan."