The post-apocalyptic story follows Kenshiro, a martial arts master, as he protects the weak from violent gangs while wandering the nuclear wasteland. He contends with rival martial artists including his brother, who rules the new world.

Set in a post-apocalyptic world. The story centers on a man named Kenshiro, a master and successor to a deadly martial art, as he wanders the nuclear wasteland protecting the weak and innocent from violent thugs. In his travels, he must contend with other master martial artists and figures from his past, including his "brother" Raoh, who has crowned himself the king of the new world.