During a time of conflict, machines called "clockworkers" were constructed to kill men. With superior strength and nearly impenetrable armor, these automatons far surpass any human. However, even though the war has long ended, clockworkers still hold onto their single purpose: fighting. With such a significant threat endangering the fragile peace, the Asteria Empire established the Clockworker Administration (CWA)—an organization that uses repurposed clockworkers to hunt their own rogue kind. Traveling across the country is CWA member Machina, a hot-tempered girl whose firm ideals may not be so different from those of her enemy. Together with her reliable repurposed clockworker partner Deus, Machina vows to destroy every clockworker in the world by any means necessary.