Miyaji founded Game Arts with his brother Yoichi at just 19. He worked on many games at the company, including Silpheed and Lunar: The Silver Star for the Mega CD, Alissa Dragoon for the Mega Drive and the Grandia series, which he created.
In 2000, Miyaji broke away from Game Arts and founded G-Mode, which primarily worked on mobile games until it gained control of arcade developer Data East’s back catalogue in 2004.
G-Mode did not comment on the cause of Miyaji’s death. Ryu Okoriyama, CEO of Gaia Holdings will replace Miyaji as G-Mode’s CEO.