A Lull in the Sea is a tV series anime that premiered in fall 2013, produced by P.A.WORKS.

About the production: the story comes from an original script, there are 26 episodes of about 24 minutes and its current status is "finished".

Its main genres are drama, fantasy, romance and slice of life, with themes such as Coastal, Love Triangle, Coming of Age and Heterosexual.

On AniList, A Lull in the Sea has an average score of 76%, a very good score, and appears on 139,413 users' lists.

Since 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 closes down, four 14-year-old middle school students from the sea village, Shioshishio, have 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 have just started appearing with the end of their childhood. (Source: Wikipedia)

Official synopsis from AniList.