After graduating from the University of Tokyo, Faculty of Law, Kozo Yamada joined TV Tokyo in 2002. In the production department, he was in charge of program production, focusing on music programs and variety shows. He specialized in planning projects in conjunction with digital media. In 2018, he became independent and engaged in producing all aspects of entertainment. He founded DEA in Singapore in the same year, operating NFT gaming platform business PlayMining. In January 2022, he led the first listing of Play to Earn token "DEAPcoin (DEP)" in Japan. Yamada is also widely recognized as an expert in NFT games and has been published in NOTE and other media.