In the floating civilization that migrates above the clouds, sound is an entity that can be solidified and forged, while color is a taboo monopolized by the powerful. Eco, the exiled genius alchemist, caught a trace of the lost blue echo of the old world in a strange "rain of fish" that descended from the sky. In order to make this color patent public, he must sail towards the "screaming storm" that swallows up thousands of dead souls - that conscious cyclone is not a natural disaster, but the cry and testimony of the covered history of killing people. Eco will discover that his hands that steal color originated from the plundered earth. The final choice he faced was not to create a color, but whether to awaken the sleeping memories of the whole world, even at the cost of becoming the "rain of color" that awakened everyone.
