For four hundred years, Princess Isa conceals her sacred power while ruling beside four ocean lords. Then a holy rival arrives with fabricated proof, turning her beloved allies against her. Stripped of the Crystal Tear tied to her soul and hurled into the deep, Isa loses Norn, the devoted protector who gives everything to save her. His cure transforms her into something feared, yet divine chains cannot silence her vengeance as she returns to seize the realm that betrayed her.