The story takes place in a distant future in a land ravaged by nuclear war that has resulted lévaporation of most oceans and destruction of a large part of the vegetation. In this post-apocalyptic world, survivors are either dhumbles villagers trying to survive or vicious gangsters grouped into gangs sadonnent looting and persecution of these villagers. However, a martial artist named Kenshiro (Ken), a recognizable man with seven scars on his chest that it carries, is chosen to become the successor of the legendary assassin art Hokuto Shinken (?, Divine art of North Letoile). At the beginning of the adventure, Kenshiro is not really trying to help the villagers, but as its star as the guide, it is revealed as the savior awaited by a people in despair. Accompanied on his journey by two young children named Bart and Lynn, Ken will face a large number of gangs, even to confront his adoptive brothers, also disciples of the art of Hokuto Shinken. Ken will also be measured to some teachers from school Nanto Seiken (?, The sacred fist Letoile South).
