I loved reading this manga and I found the first chapter for you online so you can try it at home (it even includes how to read manga - it can be confusing at first).
This is the story of Ruka, who vividly remembers seeing a strange sight at the Aquarium where her father works. As the Aquarium workers research why fish are disappearing, Ruka meets two friends who are called to the sea, like her. She discovers that Umi and Sora were actually brought up in the sea, although they are human. What are these sights and sounds coming from the sea? What is happening to the sea creatures, and why is it so compelling for Ruka? Read this gorgeous first volume of Children of the Sea and be ready to be transported into the mysterious beauty of Ruka's world.