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.

Taishi Murataas Eiichiro Maruo (voice)
Minako Kotobukias Natsu Takasaki (voice)
Daisuke Namikawaas Takuma Egawa (voice)
Asami Setoas Himeko Sasami (voice)
Hiro Shimonoas Yukichi Fukasawa (voice)
Taiten Kusunokias Coach Yusaku Miura (voice)
Takuma Terashimaas Kojirou Kageyama (voice)
Tetsuya Kakiharaas Takuya Miyagawa (voice)
Chisa Yuukias Yuuki Tajima (voice)
Kohsuke Toriumias Coach Ryuuhei Aoi (voice)
Katsuhiko Chiba
Yoichiro Yoshikawa