Tatsuo a young foot soldier in the yakuza seeks revenge when his prostitute girlfriend dies after a session with a high-ranking Japanese senator with a taste for torture. He sets out on a 'kamikaze' mission to kill his bosses and the politician; along the way, he acquires the aid of a taxi driver Kantake, who has recently returned to Japan after living in South America for several decades and is struggling to cope with poverty and the prejudices of native-born Japanese. The two form an unlikely bond, and eventually take on father-son roles. Kantake proves to be an invaluable ally in Tatsuo’s quest to take out the mob and the senator and everyone else who gets in his way.