来自风平浪静的明天

因为所在的波路中学倒闭，新学期一开始，先岛光（花江夏树 配音）和青梅竹马向井户爱花（花泽香菜 配音）以及好友比良平千咲（茅野爱衣 配音）、伊佐木要（逢坂良太 配音）转校至位于陆地的美滨中学继续学业。先岛和朋友们是生活在海底的海之民，传说很久以前人类全部始于大海，大有一部分人迷恋陆地的生活，而放弃了神赐予的“胞衣”。千百年来，陆之民和海之民在摩擦中共存，他们之间有矛盾，有误会，也有憧憬和向往。在新的学校，先岛和爱花结识了生活在海边的少年木原纺（石川界人 饰）。 　　来自不同的种族，少男少女别样的青春故事就此上演……Long ago, humanity lived in the sea, but some humans longed to go to land and eventually left the sea behind. Now in present day, the two human types co-exist though their thinking has become as separate as they places they have lived. When their school in the sea is closed, Sea Dwellers Hikari Sakishima, Manaka Mukaido and their friends have no choice but to attend the school on land but due to a special encounter, their lives gain a new twist.