Tokyo Waters

It was the 10th year of the Mizu Calendar. Humanity was walking towards its doom with the oceans swallowing up the terrestrial and tongue being the criminal organisations like the Yakuzas, funded by the business icons, putting common people's lives at stake.

Kai a 17-year-old jolly young lad working as N-Hydra, a sailor-fighter group, founds something unprecedented, as his bloodline has something to do with all these.