Yōichi Erikawa (襟川 陽一 Erikawa Yōichi) is the co-founder of Koei,[1] along with his wife Keiko Erikawa.
Yōichi Erikawa is a game producer for Koei, using the pen name Kou Shibusawa. At first game developing was only a hobby for him. Then he came up with the game Nobunaga's Ambition, which went on to sell millions of copies in Japan. It was then that Koei switched over from a chemical wholesaler to a game development studio and publisher. Since then he has produced many games for Koei, most notably Koei's historical simulation series of game.