More and more often, the inhabitants of Sanctaphrax listen to the frightening creaking of the old chains with which the flying city is attached to the cliff of the End. A little more, and the last chain will break, dooming the majestic city to destruction. A few grains of thunderfrax are enough to save him - but who will dare to pursue the Great Storm, risking the ship, the crew and their own lives? In the old days, Academic Knights considered this their honorable duty. And now only Twig—the youngest captain of the air pirates—is capable of such recklessness. At the behest of his heart, and not for the sake of titles and glory, he equips the Thunderbolt for his most dangerous and, possibly, last campaign.