Lucia Nanami and her fellow mermaid princesses have saved the seven seas from Gackto, the madman who tried to rule the oceans with an iron fist. During the battle, Lucia discovered that Kaito, her true love, is actually a prince–and he now knows that Lucia is the mermaid who saved him years ago. But Kaito has vanished during a surfing competition, and Lucia’s dreams are haunted by an ominous angel-like menace. Is there a connection between this new villain and the surprise birth of an Orange mermaid? Lucia must unravel the mysteries. The survival of the human race may depend on her success!