In a post-apocalyptic world shattered by nuclear war, humanity clings to survival in a harsh landscape where the strong prey on the weak. Enter Kenshiro, the master of an ancient martial art known as Hokuto Shinken. While searching for water, he stumbles into a village and gets trapped by its defenders. Imprisoned, he meets Lin, a kind-hearted orphan who helps him recover.

When a ruthless biker gang attacks the village and kidnaps Lin, Kenshiro breaks free, showcasing his incredible fighting skills to rescue her. With Lin safe, he sets off on a new adventure, joined by a clever young thief named Bat. Together, they take on the notorious KING organization, notorious for their brutal deeds.

Kenshiro's quest leads him to the heart of the enemy's stronghold, where he faces a familiar foe—Shin, the leader of KING and a master of the rival Nanto Seiken style. Shin is the one who scarred Kenshiro and took his beloved fiancée, Yuria. In an epic showdown, Kenshiro triumphs over Shin, only to discover that Yuria is no longer there. The journey continues as Kenshiro seeks justice and answers in this thrilling tale of survival and strength.