In the 93rd year of the Sentence of Sand… In a world covered by the sea of sand, 513 people live in complete isolation on the mud whale, an island-like ship floating on the sand.
Nine in ten of the inhabitants of the mud whale are the Shirushi, those who have been blessed and cursed with the ability to use thymia, the sentikineses (sentimental-based psychokineses) that doom them to an early death. And the others are the Muin, who do not have the power of thymia but are long-living. The two kinds of people formed a community and living together peacefully.
One day, Chakuro, the record clerk of the mud whale, found a mysterious girl named Lykos during his reconnaissance of an adrift island. For the inhabitantsof the mud whale, she is the first person they met from outside their world. Is it a good news that opens up a new world for them? …