In a world devastated by nuclear war, civilization has collapsed into a barren wasteland where the strong prey upon the weak. Amid the ruins, a lone warrior named Kenshiro wanders the desert. Kenshiro is the sixty-fourth successor of Hokuto Shinken, an ancient assassination art that allows its user to kill opponents by striking their hidden vital points, often causing their bodies to explode from within. His journey begins after his jealous rival Shin betrays him, leaves him for dead with seven scars on his chest, and kidnaps his beloved fiancée Yuria. Kenshiro sets out to rescue Yuria and bring justice to the lawless world.

Along the way, Kenshiro forms bonds with a young orphan girl named Lin and a boy thief named Bat, who become his traveling companions. His path is filled with battles against gangs, warlords, and other martial artists. He confronts the six masters of the rival Nanto Seiken school, a divided style of assassination that splintered after the war. Chief among his enemies are his own adoptive brothers from the Hokuto clan: the cunning Jagi, the gentle but mortally ill Toki, and the ambitious Raoh. Raoh, the eldest brother, defied Hokuto’s laws by killing their master Ryuken and proclaimed himself Ken-oh, the Fist King, seeking to conquer the world through sheer power. Kenshiro must face Raoh in a climactic battle that decides the fate of the wasteland.

The first major narrative arc follows Kenshiro’s quest to rescue Yuria, which brings him into conflict with Shin and the Nanto Seiken masters. He defeats Shin and learns that Yuria is alive but held by Raoh. Kenshiro then fights a series of increasingly powerful adversaries, including the prison warden Uighur, the deadly Souther, and his own brothers. The struggle culminates in a final showdown between Kenshiro and Raoh at the sacred training ground of Hokuto. Kenshiro emerges victorious, and Raoh dies peacefully, bringing a temporary peace to the world. Kenshiro reunites with the dying Yuria and spends her final moments with her before she passes.

Years later, a new threat rises in the form of the Celestial Empire, a tyrannical regime ruling from a capital city. Bat and Lin, now grown, lead the Hokuto Army to fight the empire’s oppression. Kenshiro returns from seclusion to aid them. They discover the empire is controlled by the corrupt viceroy Jakoh, who has imprisoned the true Celestial Empress. After freeing the empress and defeating Jakoh, Lin is captured and taken to the distant Kingdom of Shura, a brutal land ruled by three demon-like overlords who wield the dark Hokuto Ryuken style. Kenshiro and the warrior Falco pursue her. In Shura, Kenshiro learns his own origins and faces the mightiest of the overlords, Kaioh, who plans to destroy all followers of Hokuto Shinken. Kenshiro uncovers the sealed teachings of Hokuto’s founder, which reveal the secret to defeating Kaioh. After a fierce battle, Kenshiro triumphs, rescues Lin, and leaves her under Bat’s protection.

The series concludes with Kenshiro taking Raoh’s orphaned son Ryu under his wing, guiding him to become the next successor of Hokuto Shinken. Kenshiro continues to wander the wasteland, defending the helpless and upholding the legacy of the North Star.