The Seiryu Clan (星龍会; Seiryu-kai) is a yakuza organization operating out of Yokohama, which is featured in Yakuza: Like a Dragon. The Seiryu Clan are the biggest yakuza group based in the city of Yokohama. According to the organization's current chairman, Ryuhei Hoshino, the Seiryu Clan was first formed in the immediate aftermath of World War II. Back then, the Clan controlled most of the black markets in occupied Yokohama and protected local businesses from looters in exchange for protection payments.