In this world covered by half of the Sea of Rest, the Land of Grace is the largest of the few remaining landmasses. This is considered a continent favored by the sea god. After thousands of years of war, joy, and peace, life has continued to thrive here. However, with the emergence of a mysterious organization, the legend seems to have become reality, and the world seems to be involved in huge secrets and crises. The leader of the mysterious organization and the teenagers who were searching for the prophecy also began their respective destinies.