On the horned Capra Isles, Princess Elara is offered as a sacrifice to sea king Nerion, who spares her for her unique ancient aura. Betrayed by her power-hungry mother and jealous half-sister Selene, Elara forms a tidal bond with Nerion to seize her rightful throne. Selene sides with Frost King Ver, who steals Nerion’s abyss power and controls Elara’s mind. After fierce battles, a redeemed Selene aids them. They defeat Ver, abolish brutal maiden sacrifices, and safeguard the island alongside the sea king.