A young girl named Ruka, whose parents are separated, forms a connection with two boys, Umi and Sora, who were raised by dugongs in the sea. She discovers she shares a supernatural bond with the ocean, tied to strange events like sea creatures appearing far from home and aquarium animals vanishing worldwide.

Children of the Sea
In this underwater mystery, a curious young girl stumbles upon a global puzzle and joins forces with two enigmatic boys, propelling her into an electrifying quest.