NAGI NO ASUKARA

Long ago, human civilization had lived on the ocean floor. However, there were many humans who wanted to live above the surface and they moved to land creating a fundamental separation between the two. After their school closed down, four 14-year old middle school students from the sea village, Shioshishio, had to attend Mihama Middle School on the surface. What follows is their struggles to adjust to a new environment and the relationships between the sea and land people, while dealing with their own newfound feelings that had just started appearing with the end of their childhood.

Informations Source: Wikipedia