|Manga chapters||Chapter 3-Chapter 5|
|Story arc navigation|
Gun Metal, Calico Road Arc
Musica Ex Machina Arc
While making an arms delivery to a Certain Eastern European country, Koko's Squad stumbles into a local border war between that nation and Russia. Things are further complicated after CCAT arrives on the scene.
- This arc was voted as the 15th most popular arc in a poll conducted by Sunday GX which ran from June through September 2012.
- The main conflict of the arc, between Russia and a Certain Eastern European country over a pipeline, mirrors the real-life Russia–Ukraine gas disputes.
|Story arcs: Fire Hare Arc • Gun Metal, Calico Road Arc • Pulsar Arc|
|Corresponding episodes: Episode 1 • Episode 2|