As soon as Nick Davis is released from prison after serving one year in solitude, he is hired to drive a forklift in a warehouse in the port owned by Isshin Tendo, the patriarch of the Japanese Yakuza. Dino Campanela's organized crime syndicate launches an attack on the location, and Nick is called in to save the life of Shuji Sawamoto, a representative of Yakuza interests in America, who is being held hostage by the mob. After Nick swears an oath to join the Yakuza, Shuji employs him to work for the organization and becomes his godfather in the family. Nick, on the other hand, is a lonely FBI undercover agent who has been assigned to infiltrate the criminal organization. As soon as the FBI learns that Campanela is planning an all-out attack on the Yakuza, Nick's boss Littman orders the operation to be halted in order to leave the dirty work to the Italian Mafia. Nick's relationship to Shuji and his goddaughter Yuko, on the other hand, compels him to assist his Japanese family members.