In a future where conventional warfare has been rendered obsolete, the world is divided among four superpowers: the Legitimacy Kingdom, which values tradition and nobility; the Capitalist Corporations, a profit-driven conglomerate; the Information Alliance, which prioritizes knowledge and cybernetics; and the Faith Organization, a union of theocracies. The engine of this new world order is the Object, a spherical, 50-meter-wide mecha armed with enough firepower to make tanks, fighter jets, and even tactical nuclear weapons seem like relics. Because only an Object can theoretically destroy another Object, battles have become ritualized duels between these machines, fought in designated zones while citizens in safe countries remain untouched by the horrors of war.

The story centers on the Legitimacy Kingdom’s 37th Mobile Maintenance Battalion, considered the military’s dumping ground for troublesome personnel and hopeless missions. The battalion is anchored by its Object, a first-generation unit named Baby Magnum, and its elite pilot, the young and stoic Milinda Brantini, nicknamed the Princess. Commanding this unruly outfit is the stern yet secretly caring 18-year-old Major Frolaytia Capistrano, a noble and Japanese culture enthusiast who wields a smoking pipe from her tatami-mat office.

The true protagonists, however, are not the elites but the common soldiers. Qwenthur Barbotage is a battlefield student and aspiring Object designer from a平民 background, hoping to earn enough money to escape a life of poverty. His best friend and polar opposite is Havia Winchell, a cynical and loud-mouthed nobleman’s son serving as a radar analyst to gain the prestige needed to secure his family inheritance. Together, they form an unlikely duo of infantrymen in a world that has declared foot soldiers useless.

The status quo is shattered in their first mission. When Baby Magnum is defeated and Milinda is captured by the Faith Organization, Qwenthur and Havia ignore all military doctrine. Using their wits, scientific knowledge, and sheer improvisation, they successfully destroy an enemy Object with nothing but explosives and ingenuity. This miracle brands them as Dragon Killers, a propaganda tool for the military. From that point forward, the 37th Battalion is deliberately sent on the most absurd and dangerous operations imaginable, with Qwenthur and Havia routinely sent on foot to replicate their impossible feat.

The narrative follows a structured loop across its 20 volumes. Qwenthur uses his engineering acumen to analyze the unique scientific principle behind a new enemy weapon—whether it be plasma cannons, electronic warfare, or exotic materials—while Havia provides tactical support and cynical commentary. Their plans are rarely about firepower and always about exploiting the hidden vulnerabilities that come with any advanced technology. The series is notable for its hard science fiction approach, often diving deep into the theoretical mechanics of each weapon system to find its Achilles' heel.

Several notable arcs define the series. The Alaska and Kamchatka arcs introduce the brutal reality of the infantry support role, featuring suicide missions and the death of supporting characters. The Oceania arc sees the quartet of powers forced into an uneasy alliance, pitting the Baby Magnum against a rogue third-generation Object and highlighting the fragile political nature of the clean wars. Later volumes expand the scope beyond simple Object duels to include internal political conspiracies within the Legitimacy Kingdom, the introduction of rival elite pilots like the pop-star pilot of the Information Alliance known as Oh Ho Ho, and the constant threat of the Capitalist Corporations deploying superior second and third-generation machines.

Despite the high-stakes setting, the series maintains a surprisingly lighthearted and comedic tone. The banter between Qwenthur and Havia is fast-paced and absurd, often devolving into slapstick arguments in the middle of life-threatening situations. While Milinda develops a quiet crush on Qwenthur, the romantic subplots are secondary to the thrill of problem-solving. Each volume resets the status quo, meaning there is little long-term character progression for the main trio, but this episodic structure allows readers to jump into any adventure without prior knowledge. The thematic core remains consistent: the arrogant reliance on overwhelming technological supremacy is a weakness to be exploited by human creativity and will.