The end of the world that the sea god predicted came sooner than expected, in fire and blood instead of ice / collection of stand-alone pieces for a NagiAsu x OwaSera fusion series.

A sacrifice was to be made in order to appease the wrath of the sea and there are no better sacrifice than the pariah of the island. This sacrifice doomed her descendant to the same fate and centuries later, a boy was born with the same beauty and power the ancestor had. Will he be able to end the cycle of sacrifice and appease the loneliness in the heart of the Sea God? (Yaoi)

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. Rei never believed this legend until he saw a girl surfacing from the ocean, one morning he was on his way to school.

Yumi was from the sea village who starts high school in Yokohama.When she met theo,theo tells her about hamatora.