Tatsuya Uesugi is the twin brother of Kazuya, pitcher of the Meisei High School baseball team. Irresolute about his feelings towards baseball, his next door neighbor, and his brother; Tatsuya ends up joining his school's boxing club. From the sidelines, he quietly watches the ascension of Kazuya.

• Group TAC
• Yuji Mitsuya
• Keiichi Nanba
• Noriko Hidaka
• Hayashiya Shōzō IX
• Hiromi Tsuru
• Kaneto Shiozawa
• Banjo Ginga