As one of the seven mermaid princesses, Lucia must travel to the human world to protect the mermaid kingdoms.
Lucia Nanami (voice)
Hanon Hōshō (voice)
Rina Tōin (voice)
Hippo (voice)
Nikora Nanami (voice)
Madame Taki (voice)
Tarō Mitsuki (voice)
Noel (voice)
Caren (voice)
Kaito Dōmoto (voice), Gaito (voice)
Coco (voice)
Seira (voice)
Michal Amagi (voice)
Rihito Amagi (voice)
Masahiro Hamasaki (voice)
Nagisa Shirai (voice)
Maki (voice)
Izul (voice)
Eriru (voice)
Sara (voice)