The high seas, chivalrous knights, and a mythical Age of Exploration are all parts of the new world from the creator of Battle Angel Alita! Ashika, the son of a lighthouse keeper, has become a slave to the richest and most pampered person in the world: the imperialist Alcontra, who destroyed the lighthouse of Faro. As Alcontra's seashell-shaped ship rolls across the ocean in fully automated comfort, aqua knight Ruliya is in pursuit ? but how will Ashika adjust to his new life in this mechanized and formalized vessel? And what priceless jewel is stashed in the ship's bowels?
— Description from Comic Vine community (comicvine.gamespot.com).