In the world of Heavy Object, the collapse of the United Nations has left the world divided into four major powers: the Legitimacy Kingdom, the Information Alliance, the Capitalist Corporations, and the Faith Organization. With the advent of Objects—massive, heavily armored machines with overwhelming firepower—traditional warfare has become obsolete. Conflicts are now resolved through battles between these Objects, leading to what is perceived as "clean" and bloodless wars.
In a military base in the frozen wilderness of Alaska, Quenser, a mechanic-in-training, is learning the intricacies of Object design and maintenance. There, he meets Milinda, an elite Object pilot. As their relationship grows, Quenser begins to uncover the harsh realities of war, realizing that the supposed bloodless nature of these conflicts is merely a façade, concealing the true brutality of warfare.