| Name: Mizuno Kachiro
School: Seishun Gakuen 1st Year Birthday: 4/7 Status: Seigaku Tennis Team |
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| Blood type: O | |
| OTHER:
Katsuo is another one of Ryouma's friends. He is best friends with Kachirou whom he has known since elementary school. |
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| Family: ??? | |
| Kanji: Mizu 水 means "water" | |
| Seiyuu: ??
Birthday: History |