Aqua Knight

On a small island in the Marmundo ocean, an old man and his young son, Ashika, live in a lighthouse that stores a mystical light called Niselle. When a young knight, Lady Ruliya, is swept off course during a storm, Ashika rescues her and becomes determined to become her squire. However, his father, a skilled warrior, challenges Ruliya to a duel before allowing her to take Ashika as her squire. During the battle, the lighthouse is destroyed and the old man killed by the villainous Alcantara, who also steals Niselle and kidnaps Ashika. Ruliya, now armed with the magical blade Muertogara, emerges from the sea to claim the old man, but is informed by the knight of the Underworld, Tagmec, that she is embarking on a quest of destiny, and must now rescue the boy and reclaim the light.