Kujira no Kora wa Sajou ni Utau

Chakuro records the lives of his community aboard the Mud Whale, an islandlike vessel drifting across an immense sea of sand. Many of its inhabitants possess supernatural abilities but die young, and their isolated society knows little of what lies beyond its own fragile home.

The discovery of another island leads Chakuro to a girl named Lykos, whose knowledge overturns his understanding of the outside world. Her arrival is followed by dangers the Mud Whale can no longer avoid, forcing its people to confront the hidden history behind their isolation and fight for the future they hoped to share.