Children of the Whales (クジラの子らは砂上に歌う, Kujira no Kora wa Sajō ni Utau, lit. "Whale Calves Sing on the Sand") is a manga written and illustrated by Abi Umeda. It is licensed in North America by Viz Media. An anime adaption by J.C.Staff aired on October 8, 2017.
The story focuses on a boy called Chakuro, who lives on the giant vessel called a Mud Whale that drifts over the sea of sand. In the Mud Whale, society is divided into two kinds of people: the Marked, who can move objects with their minds using a strange power called "thymia", at the expense of shortened lifespans, and the Unmarked, people who lack thymia but enjoy longer lifespans. Chakuro and his friends have never seen anyone from the outside world, and they spend their days yearning to explore and learn about it. One day, the Mud Whale encounters a lonely island and Chakuro finds a girl inside, starting an adventure that changes the lives of everyone.