2251 year. Planet Earth is fragmented into many islands floating in the air, and people are divided into two castes. Water becomes the main value of the dying planet, for the possession of which the Seijin and Jinsey castes are fighting. Valerie, a seijin girl, is trying to solve the riddle: what kind of catastrophe changed the Earth many years ago? Lorenzo and his father, from the Jinsey caste, travel on an airship in search of precious disappearing water. Unexpectedly, fate brings them together and gives them files with secret information. Now they need to get ahead of the Sphere agents and unravel the mystery of the world of Skyland...