Tatsuichi Shimizu (清水 辰一 Shimizu Tatsuichi Tatsuichi Shimizu?) was a ningyō (任侠) -also known as yakuza- who run the Ginkin Gambling Den (鉄火場銀金 Tekkaba Ginkin) and trafficked ruthlessly with a pernicious drug called shishi (シシ), extracted from the Kodama leaf (木霊草 Kosdama-sō).