Children of the Sea

Ruka is a young teenager whose parents have separated. His father works at the local aquarium, so he spends a lot of time there, fascinated with the huge amount of marine species that meet there. One day, two boys named Umi and Sora are transferred to the aquarium for family problems. After coming into contact with them, Ruka realizes that they both have a special connection with the ocean, just like her. However, the power of his two new friends seems to interfere with the interests of the aquarium and the population in which everyone resides.