In the post apocalyptic future, violent gangs prey on villages who struggle to survive on what little vegetation remains on the earth. Four brothers protected the innocent, built armies and trained in the martial art of the North Star known as Hokuto Shinken, a legendary fighting technique which gives impossible strength and endurance, attacking an opponent's 108 pressure points to cause destruction from within. According to the art's law, only one successor per generation can become master of the deadly art of Hokuto Shinken. Before the youngest of the brothers, Ken, claimed the title of the Fist, there was another master trained in the art of Hokuto Shinken, the King of the Fist, the Divine Fist of Heaven: Raoh. An ultimate assassin, the ultimate warrior.inheritor of the North Star.