Kaijuu no Kodomo

Ruka is drawn to the aquarium where her father works and to two unusual boys she meets there. Umi and Sora were raised by dugongs, and their connection to the sea seems to answer a mysterious pull she has felt since childhood.

As fish begin disappearing around the world, the children are swept toward a phenomenon the adults cannot fully understand. The ocean becomes both a meeting place and a doorway into mysteries far larger than the lives they knew on shore.