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.
| Actor | Role |
|---|---|
 Yuji MitsuyaTatsuya Uesugi (voice) | Tatsuya Uesugi (voice) |
 Keiichi NanbaKazuya Uesugi (voice) | Kazuya Uesugi (voice) |
 Noriko HidakaMinami Asakura (voice) | Minami Asakura (voice) |
 Hayashiya Shōzō IXKoutarou Matsudaira (voice) | Koutarou Matsudaira (voice) |
 Hiromi TsuruSachiko Nishio (voice) | Sachiko Nishio (voice) |
 Kaneto ShiozawaTakeshi Kuroki (voice) | Takeshi Kuroki (voice) |
 Banjo GingaShouhei Harada (voice) | Shouhei Harada (voice) |