Compilation film for Kouya no Kotobuki Hikoutai which will also contain new footage. 
 
In a desolate world where the safest form of transporting cargo is by zeppelin; air pirates roam the sky, preying on aerial commerce and holding remote towns for ransom. Against these airborne marauders, the only defense is to hire high-flying protection of your own, and that's where mercenary pilots like the girls of the Kotobuki Squadron come in. Behind the joysticks of their lightweight Nakajima Ki-43 Hayabusa fighters, these lady falcons play a deadly game of escort, where a single mistake can end up in a fiery crash or mid-air collision. But for birds of prey like Kylie, Reona, Chika, Emma, Kate, and Zara, the danger is worth it for the chance to spread their wings and soar into the heavens. 
 
(Source: Sentai Filmworks)