Teenage Clare (Emma Roberts Emma Roberts) and Haley (Joana Livisk Joanna 'JoJo' Levesque) are a pair of beautiful and lively friends. Haley, whose mother is a marine biologist, will leave the United States for Australia with her family after school begins. The two sisters are about to be apart, and they take advantage of this summer vacation to come to the beach to enjoy themselves, hoping that they can spend more time together. Here, they encounter a strange thing: a legendary mermaid Akuma (Sarah Paxton Sara Paxton) intrudes into their lives. It turned out that Akuma came here along the ocean current in order to find true love in the world within three days. Otherwise, she will be forced to marry someone she doesn't love. And diving lifeguard Raymond (Jack McDorman Jake McDorman) is the Prince Charming in her heart. Akuma asked Claire and Haley how to win the prince's heart. However, at the beginning of the love affair, the two sisters were also relaxed and happy about Raymond, and their coquettish rival Cecilia (Arielle Kebbel A.