Dead or Alive: Final (2002)

Watch Dead or Alive: Final: Set in a post apocalyptic Yokohama where the population is kept under rigid control by a half crazed mayor, Riki Takeuchi is a hard boiled cop and Show Aikawa a mellowed out drifter that hooks up with a gang of rebels. When the gang kidnap Takeuchi's son, the wheels are set in motion that leads to an inevitable showdown.