Harry Kilmer, a retired private investigator, travels to Japan to help his old army buddy, George Tanner, whose daughter has been kidnapped by the yakuza—a powerful, organized crime syndicate in Japan. Thirty years prior, during World War II, Kilmer had served in Japan and formed a deep personal bond with a Japanese woman named Eiko Tanaka. To secure help in rescuing Tanner’s daughter, Kilmer seeks out Eiko's brother, Ken, who harbors mixed feelings about Kilmer due to past events.

As Kilmer and Ken join forces, they navigate the dangerous underworld of the yakuza, confronting violent gang members and uncovering layers of betrayal and deception. Their quest is not just a simple rescue mission; it becomes a journey into the complex interplay of honor, loyalty, and the passage of time. Tensions rise as cultural differences and old wounds resurface, putting their fragile alliance to the ultimate test.