Eastport, a place of former peace, has rapidly turned its back on natural power wielders known as "elementals." Under the rule of domineering Magistrate Rufus, elementals are subject to fates of imprisonment, death, and forced exposure to a mysterious substance known as eusgare. While the future continues to look grim for elementals, the ocean tides seem to have other plans. Four brothers, united by royal blood and a shared goal of restoring the kingdom, must find a way to work together before it is too late.