Ener is about to launch his final attack on Skypia, reducing the island to nothing. Thousands of inhabitants of the skies flee the catastrophe, and the devastating lightnings that precede the attack. For their part, most of the pirates are in a bad position and Wiper, who is with them, remembers, bitter, the past told him by the village leader when he was a child. The great friendship that bound his ancestor, Calgara, to a certain... Montblanc Norland.