Teenagers always feel different, but these three truly are: they are mermaids. Keeping their special powers a secret is a challenge for a fearless princess named Maysilee and her human best friends, Nami and Sophia. When not at school, they use their magical powers to save sea turtles and help those in need, all while battling the evil pirate RavenCyrus and the witch Tabitha. Local bully Charlie and his snobby girlfriend, Trixie Robins, keep a close watch on Maysilee and her friends whenever they transform into mermaids. However, the girls head east to keep their adventures under wraps—except from their human friends Chase, Megan, Riddle, and Newton, who help them out.