Kujira no Kora wa Sajou ni Utau takes viewers on a journey to a world covered by an endless sea of sand, where the Mud Whale island lies. Within it is an ancient town inhabited by individuals known as Marked, possessing supernatural abilities at the cost of a shortened lifespan. Chakuro, a young and curious archivist of the village, spends his days documenting the exploration of newly discovered islands. Explore the mysteries and dangers that await in this captivating tale of discovery and sacrifice.