In a barren world reliant on zeppelins for safe cargo transport, air pirates terrorize the skies, targeting airborne trade and terrorizing isolated communities. To combat these sky bandits, hiring skilled mercenary pilots like the Kotobuki Squadron, led by female aces, is crucial. Maneuvering their Nakajima Ki-43 Hayabusa fighters, these daring pilots engage in perilous escort missions where one misstep could lead to a catastrophic crash. Despite the high stakes, aviators Kylie, Reona, Chika, Emma, Kate, and Zara embrace the risks for the exhilarating freedom of flight among the clouds.