The Japanese mafia, known as the Yakuza, is increasingly spreading in the United States. FBI agent Nick David is tasked with infiltrating the organization and manages to save the life of one of its leaders, making him the first American ever to be initiated into the bloody brotherhood. While Nick participates in the war between the Yakuza and the Mafia, he begins to appreciate his position a bit too much. The underworld is on the verge of exploding, and Nick must now choose between the temptations of the criminal world and his loyalty to law and order.