In the "Alchemy Republic" where matter and emotion can be made into each other, words have entities - bad words are condensed into "word stones" that hurt people, and praise is turned into "word flowers" that heal. Aska, the shepherd in the clouds, drove the giant cloud whale to roam the stratosphere, but due to a strange "rain of deep-sea fish", he witnessed the depletion and crisis of the earth's emotional veins. A concept-erasing virus called the "silence epidemic" is spreading. It devours core emotions such as "hope" and "courage" and turns people into empty shells. The top leaders of the Republic actually want to use this to purify "unstable factors." In order to heal the dying planet, Askar must penetrate into the core of lies in the world, awaken the Cloud Whale's forgotten ancient mission, and confront the inner furnace that absorbs emotions and forges the illusion of eternity. He will discover that what he protects is not only the cloud whale and the sky, but also the last light of human emotion that has not been drained out.
