Koei (now Koei Tecmo Games) co-founder Yoichi Erikawa uses the pseudonym Kou Shibusawa for his producer's credits. He has also taken credit as Eiji Fukuzawa.
Koei co-founders Yoichi and Keiko Erikawa were named by Forbes as one of 2018 Japan's 50 Richest People. Koei is now Koei Tecmo Games with Yoichi serving as President and CEO while Keiko serves as Chairman.
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