Young aeronaut Spifi became a student of the famous captain Morton - the greatest among the explorers of heaven. So he got involved in the mortal enmity of two illustrious aces, where the stake is the freedom of his native lands, which the empire of fanatics worshiping a mechanical god longs to subjugate. The fate of the world can be decided by the legacy of a mysterious race: the giant ship "Sorrow" hidden in unknown distance. The crew of the "Scarlet Blade" are waiting for endless expanses of heaven and air battles, intrigues and ingenious enemies. But is the threat of the Mechanical Empire so great compared to the one that harbors human ambitions and fears?