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Hiroshi Yamanaka (山中 浩)Hiroshi Yamanaka, is Kiyomaro's excessively sports-crazed friend. He believes he is in a constant competition with Kiyomaro when it comes to athletic competitions to establish a friendly rivalry with him. He has big dreams of playing in the major leagues one day in his future. He is first introduced in episode 3 after Kiyomaro foiled Reycom and Hosokawa's bank robbery, telling Kiyomaro that he "had guts".
He is also shown to comfort Suzume when she got 10 percent saying that he and Kiyomaro's other friends got perfect zeroes in the same test.
(Source: Zatch Bell! Wiki, edited)