In a feudal Japan torn by turmoil, an esteemed samurai executioner serves the Shogun, maintaining order with his deadly skill. However, when the Shogun grows paranoid and perceives the samurai as a threat, he orders the death of the samurai's entire family. The samurai's wife is brutally murdered, but he narrowly escapes with his young son. With nothing left but a burning desire for vengeance, he abandons his role and fatefully determines to wander the land as a ronin, accompanied by his son in a wooden cart equipped with hidden weapons. Together, they embark on a relentless journey of survival and retribution, facing wave after wave of assassins sent by the Shogun to eliminate them.

Despite the constant danger, the bond between father and son deepens as they navigate a harsh landscape fraught with political intrigue and betrayal. The samurai, with his unmatched swordsmanship, dispatches numerous enemies, earning a fearsome reputation. The Shogun's relentless pursuit forces the pair into numerous deadly confrontations with various skilled adversaries. Each confrontation proves both a physical and emotional test of their strength and resolve. Pursued by enemies and haunted by loss, they forge ahead, driven by a singular goal: to strike against those who wronged them. Their journey is a tale of endurance, honor, and the unwavering bond between a father and his son in the face of relentless adversities.