Long ago, all humans lived beneath the sea. However, some people preferred the surface and abandoned living underwater permanently. As a consequence, they were stripped of their god-given protection called "Ena" which allowed them to breathe underwater. Over time, the rift between the denizens of the sea and of the surface widened, although contact between the two peoples still existed. Nagi no Asu kara follows the story of Hikari Sakishima and Manaka Mukaido, along with their childhood friends Chisaki Hiradaira and Kaname Isaki, who are forced to leave the sea and attend a school on the surface. There, the group also meets Tsumugu Kihara, a fellow student and fisherman who loves the sea. Hikari and his friends' lives are bound to change as they have to deal with the deep-seated hatred and discrimination between the people of sea and of the surface, the storms in their personal lives, as well as an impending tempest which may spell doom for all who dwell on the surface. Long ago, humanity lived in the sea. But the humans who longed for the land left the sea behind. They cast aside the special raiment they’d been given by the sea god that let them live in the ocean. The thinking of the sea humans and the land humans became as separate as the places they lived, and as countless time passed, they forgot they were once one people. This will change as the land-dwelling human Tsumugu Kihara befriends four girls who live in a village at the bottom of the sea.