Children of the Sea

Ruka Azumi spends her summer trying to stay away from home, throwing herself into handball to avoid living with her alcoholic mother. After an incident at practice gets her pushed off the team, she drifts toward the aquarium where her father works, searching for somewhere else to belong.

There she meets Umi, an enigmatic boy said to have been raised by dugongs and kept at the facility for study because of his unusual, water-reliant body. As Ruka grows closer to Umi—and to his brother, Sora, who shares an equally uncanny bond with the sea—their days begin to revolve around the ocean’s quiet mysteries and a strange “festival” that marine life across the world seems to be anticipating.