Nariyuki Koshimizu (越水成雪) is a student at Oosugi High School and a member of the tennis club at the school. He enjoys competing with Eiichiro Maruo at exam scores and tennis, although he loses at all of them.
AppearanceEditKoshimizu is first seen to have extremely slanted eyes, although his eyes later open as he reveals his true personality. He has long brown hair and was seen wearing an Adidas t-shirt during his match against Eiichiro Maruo.
|Eiichiro Maruo||3-6||Lose||Kanagawa Junior Tennis Circuit Year 2||1|