In a class society composed of floating islands, Lan, who shepherds cloud whales, firmly believes in "equality of lift" and is eager to break the monopoly of flight. When the entire sky strangely turned into eternal green in his eyes, and everyone in the world regarded it as normal, Lan realized that the laws of the world were failing him alone. This change triggered the "Eternal Sorrow Vortex", a natural disaster storm that was born from the despair of all living beings and possessed consciousness. Lan must control the cloud whale, explore the truth behind the discoloration of the sky between the green sky and the hunting storm, and realize the forbidden dream of flying freely. However, the secret he will discover is far more terrifying than the storm: all the islands he stands on are alive. His struggle may become the final clarion call to awaken the sleeping beast and subvert the entire civilization.
