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. This is about their lives and how they adjust to a new environment and the relationships between the sea and surface people.
/From wikipedia
I wonder if somebody is watching this. If you liked True Tears or Anohana you might like this, it's full....FULL of love triangles, but the characters are really likable, and the sea dwellers/land dwellers is a huge issue as well, the summary is pretty lame but there's a lot more in the series than love triangles and enemity from the land/sea. The art is really pretty, and the music fits the series really well. There's a lot of drama, some interesting twists and you can't help but try to understand what the characters are thinking at times.
I won't write more until I know somebody watches this lol.