Mayumura is a student of Kaido's middle school team. Once he was accepted he did not want to play with rubber balls in the final tournament, but does so as a favor to Chief to punish Goro for underestimating them.

His pitches are: Gyroball, Forkball, Screwball and a Shootball/Shuuto (Which he only uses as his last pitch if he is throwing a perfect game). He played for Warriors as a pro in Japan before going to Majors and he was chosen to be a japan rep during world cup and manages to hold for 5 innings, he later married his manager and has a son named Kenta

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