Pichi Pichi Pitch 3: Mermaid Melody

Lucia and her sister run a public bath that's all the rage, but they have a secret. They are mermaid princesses living among humans to search for Lucia's pearl that she lost years earlier. Without it, she can't sing and save the seas from an evil force bent on taking control of the marine world.Lucia is a mermaid princess on an important mission to save the seven seas from an evil force determined to take over the marine world, but she is also a young girl who falls for her handsome classmate Kaito, who does not know her secret.