Koyama Ryugo
(小山竜吾) Nihon Kiin Professional, 7p in 2020 (130 wins, as of March 13). Son of Koyama Shizuo and father of Koyama Kuya.
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(小山竜吾) Nihon Kiin Professional, 7p in 2020 (130 wins, as of March 13). Son of Koyama Shizuo and father of Koyama Kuya.