Kachiro Kato hangs around a lot with Satoshi Horio and Katsuo Mizuno. Although he is not very good at tennis he thoroughly supports the team. He has a father who coaches at an expensive tennis club. Though he is normally polite and meek, Kachiro believes strongly in justice and fights to the end to defend his beliefs. 

Echizen Ryoma's Himalayan cat.   Karupin is used as a symbolic device in the series. For example Nanjirou teases/plays with Karupin in ways that parallel the manner that Ryoma's tennis matches are proceeding.  When Karupin overcomes Nanjirou's teasing, the tide turns in Ryoma's matches.

Keiko is one of Nanami's three henchmen. Like many other girls at the school, she has a secret obsession with Touga. Keiko is in love with him and wishes only to be with him. However, she knows that Nanami's clout and Touga's rank makes it impossible to even approach him.

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Akira Nakagawa

Characters