| Eiichirō Maruo (nicknamed "Ei-chan" for his grades being straight "A") is an honor student, bookworm, and is not interested in anything other than studying. In order to solve his problem of lacking physical strength, he enrolled a tennis school and soon found the fascinating side of tennis. Being a tennis newbie lacking physical strength, he supplement his shortcomings with his excellent observing and analyzing skills. |
| Name | Character | Episodes |
|---|---|---|
| Takahiro Sakurai | Yuu Nabae (voice) | 50 |
| Asami Seto | Himeko Sasami (voice) | 50 |
| Daisuke Namikawa | Takuma Egawa (voice) | 50 |
| Hiro Shimono | Yukichi Fukasawa (voice) | 50 |
| Yoshimasa Hosoya | Souji Ike (voice) | 50 |
| Tetsuya Kakihara | Takuya Miyagawa (voice) | 50 |
| Natsuki Hanae | Krishna Rames (voice) | 25 |
| Hiroshi Kamiya | Alex O' Brien (voice) | 25 |
| Megumi Han | Marsha O'Brien (voice) | 25 |
| Takuya Eguchi | Atsushi Taira (voice) | 25 |
| Akio Kato | Kevin Morland (voice) | 25 |