Gintoki_forever

Imagine a world where humanity lives in the sky, forced to abandon the land as the oceans consumed it. Ingrit Clodines dreams of exploring the ocean depths as a Mage diver, but his weak magic and impoverished upbringing make it an impossible goal. Without the resources to grow stronger, his aspirations seem doomed to remain a fantasy.

Everything changes during a fateful underwater mission. Betrayed by a teammate who removes his oxygen mask, Ingrit is exposed to the poisonous sea and left for dead. As he succumbs to the darkness, a voice echoes in his mind: 
[O you Chosen one. You are not allowed to die yet]

Revived by an ancient force, Ingrit becomes one of the "Chosen" and discovers a power far beyond anything he could have imagined. But with this new strength comes a dangerous destiny—one that ties him to the mysteries of the ocean and a betrayal that could shatter the world above.

Chapter 3.5