A short spin-off anime released on Kouya no Kotobuki Hikoutai: Oozora no Takeoff Girls! game app and YouTube. (Source: AniDB)

It has been half a century since humans took to the sky to hunt dragons. Although dragons present a great danger, every part of them is extremely valuable, and brave dragon hunters, called drakers, risk their lives aboard special dragon-hunting airships to pursue them. However, despite the thrill and excitement of hunting, the life of a draker is not easy. Ostracized by society, the drakers have no place to call home. Life in the air is not any easier either: maintaining an airship is dull and expensive—and dragons are even harder to catch, as each one is unique. One of the last remaining such airships is the Quin Zaza. Its courageous crew includes Takita, an eager newcomer trying to earn her place on the ship; Mika, a reckless but highly skilled hunter; and Jirou, an earnest young man chasing both the dragons and his past. United by the same goal, these hunters face arduous aerial battles that involve daring feats of skill, strategy, and more than their fair share of danger.

Futuristic post-war Japan is divided into four military regions, each led by conflicting nations trying to gain complete control over the country. While the Boundary War—fought with the help of humanoid mecha weapons called AMAIM—has long been over, the rivalry between these factions is still ongoing, and, as a result, the Japanese are heavily oppressed. Amou Shiiba, a 16-year-old orphan boy who is secretly rebuilding an abandoned AMAIM named Kenbu, stumbles upon Gai, an autonomous AI in need of battery power. By choosing to help one another, Amou and Gai find themselves at the center of a disaster, and Amou is labeled a terrorist and cast out of society. Even so, Amou refuses to remain idle in the face of injustice, and he embarks on a long journey rife with struggle and companionship. His aim transitions from leading a peaceful life to liberating the Japanese people.