Zetian lives in a world that has been at war with invaders for several centuries. The main weapons of this war are fighter planes, controlled by the vital energy of a pair of pilots - a man and a woman. Women, having given all their energy, die in the first battle. But Zetian emerges from the cabin unharmed. Now she is called the Iron Widow, and only one male pilot can cope with her power - Li Shimin, the assassin, the Iron Demon.