Azel and Sonia are two lifelong friends enjoying a tranquil life on Finith island until they're struck by a mysterious curse. They awaken to find both of their souls trapped in the same body! On top of that, the Finith they knew is gone, and in its place is a strange island populated with unfamiliar faces. Only by exploring this new world will they be able to solve the mystery of this curse that has befallen them. In their quest, Azel and Sonia will be aided by a colorful cast of characters, and take command of the towering golem Ymir. Using Ymir, they'll cross vast seas, discover hidden islands, and battle fearsome monsters of the deep!