Children of the Sea

The heroine, Ruka, who was banned from taking part in the activities of her club during the summer vacation, meets a strange boy named Umi. She is fascinated by Umi, who she sees swimming freely in an aquarium, and finds out that he, along with Sora, was raised by a dugong. At that time a meteorite fell into the sea and all the fish disappeared from the world. The mystery of the sea deepens and the story spreads to encompass the life of the earth.

[Official English](https://www.viz.com/children-of-the-sea)