The first episode, the first opening, already was surprisingly good to me. The sound and animations enhanced me. They really did a good job on creating the underwater world. The details and quality were amazing, not to forget gorgeousl colors were used. It gives you some feeling you find yourself in some magical place, which it has to represent.
Not only the animating, but also the sound is really good. It was mostly the music of this serie I found, which got me watching it. The opening and ending perfectly fitted into this animes theme. I also loved to hear the sea, birds or the rustling leaves during the convos. It gave some realistic thing. As for the voices, they fit the characters and their personality perfect imo.
Then the story itself, it started as some fantasy Slice of life with the people of the sea visiting the surface. I couldn't totally understand why you would create such circumstances. But getting deeper in the story it's all about the bonds between the underwater world and the surface. In the beginning it had a perfect pace, not too fast so the story couldn't become dull. Not too slow, it will never bore you. Although mid-season it get's some fillers, they don't seem as a filler since it fits good in the storyline.
Along with the drama and romance you will experience a beautiful story in a magical setting. And that is what makes it outstanding from other animes. For a drama-fantasy-romance, with this special setting, amazing atmosphere and the elaborate effects, it seems like a perfect anime to me. If you like the slife of life / romance genre, this is a Must watch anime.
