Lucia is having problems with affairs of the heart. Her handsome classmate Kaito seems attracted to her–and she has certainly fallen for him–but there are many challenges. First, she’s a mermaid princess fighting to protect the seven seas from the corrupting influence of Gackto. Second, Gackto’s hostile minions keep threatening the lives of Kaito and her mermaid friends. Third, (and definitely not the charm), Lucia can’t tell Kaito that she’s a mermaid or else she’ll turn into sea foam. What’s worse, Lucia and Kaito just can’t stop bickering! But Lucia’s optimism and determination can overcome anything . . . right?