In a vast world of wilderness, all kinds of objects suddenly fell from the sky. They dramatically changed people's lives, especially airplanes. After that, the trend of the world shifted to the sky. Time passed - the hired bodyguard unit "Kotobuki Squadron", together with the stern and beautiful female president, the unreliable on-site commander, the maintenance team leader with a craftsman's temperament and other unique companions, in order to protect the important goods of customers, today they will also fly in the sky with the Falcon fighter.