In the post-apocalyptic wasteland of 199X, a world devastated by nuclear fire where survival is a daily struggle, an ordinary young man named Nobu finds himself desperately searching for work. After a long and fruitless job hunt, he stumbles upon what appears to be a promising opportunity. The employer offers three meals a day, company housing, and no experience necessary. The catch, which Nobu discovers far too late, is that his new workplace is the army of Ken-Oh, the warlord Raoh, the self-proclaimed King of Fists. He has unwittingly joined the most dangerous military force in the wasteland, a place where the number of deaths exceeds the number of job applicants.

The story is an official spin-off comedy that shifts the focus away from the legendary martial arts masters of the original series and instead shines a light on the lowest-ranking soldiers who are usually dismissed as cannon fodder. Nobu is the new recruit, a timid and completely unremarkable young man who lacks any combat skill and is utterly unprepared for the brutality that surrounds him. His immediate superior is Buzz, the squad leader who is perpetually exasperated by the chaos of his unit. Fellow grunt Zaku is a more capable and composed soldier, often serving as the straight man to the absurdity of their daily lives.

The series follows the daily existence of these disposable soldiers as they navigate a horrific workplace. Their duties include patrolling the desert, facing terrifying enemies, and trying to avoid being killed by their own unpredictable commander. A recurring theme is the absurdly high mortality rate, with many of Nobu's colleagues meeting sudden and graphic ends. The manga riffs heavily on the tropes of the original series, including the iconic motorbikes, mohawks, and distinctive death cries, but always from the perspective of the people at the bottom of the hierarchy. The setting is a darkly comedic version of the classic post-apocalyptic landscape, where mundane concerns about workplace safety and job security clash with the epic violence of the original narrative.

Notable narrative arcs include a tournament arc in the second volume where various minor villains from the original series, such as the Big Old Woman, Heart, and the fire-breathing soldier, compete to determine who is the strongest among the grunts. As the story progresses, it cleverly aligns its timeline with the beginning of the original Fist of the North Star series, meaning that the terrifying figure of Kenshiro begins his rampage, systematically eliminating the very soldiers Nobu works alongside. The final volume deals with the inevitable collapse of the Ken-Oh army as the events of the original story catch up to the cast, leading to a conclusion that is both a comedy and a genuine elegy for the countless nameless soldiers who served and died in a war that was never theirs.