Hitotsu Umi no Pallas Athena

is a Japanese light novel series written by Suta Hatomi, with illustrations by Torocchi. The series began publication on February 10, 2015 by ASCII Media Works under their Dengeki Bunko publishing imprint.

The series won the Grand Prize in the 21st Dengeki Novel Prize.

Synopsis
All "land" sank to the bottom of the water. The clear blue sea and the azure sky. "After" is an era in which two blues cover everything in the world. Wearing sailor clothes and living as a "man of the sea," I lived as a "messenger" who crossed the ocean and delivered luggage on my parents' keepsake, the love ship Pallas.

This ocean gives me an extraordinary "unlucky" without hesitation. -"White Squall". The ferocious nature that attacks ruthlessly. It destroyed everything floating in the sea. I lost my beloved ship, Pallas, and I arrived at an isolated and unsupported floating island. There is no food, no water, no clothes. There is just "blue" that spreads. Will help come here, or-I don't know when it will end. My "battle to live".