The Song of the Mermaid: The Story of the Movie! Hanne, Marthe, and Julia are having the vacation of a lifetime in the southern coastal village of Porto Sirente… until a mysterious spell suddenly transforms them into beautiful mermaids! If the girls want to stay out of sight, they'll have to avoid the water, which is easier said than done, and danger lurks. In the coastal village where the three are enjoying their vacation, the locals somehow consider mermaids monsters. When the girls discover that after three days they will remain mermaids forever, they embark on a race against the clock to break the spell. If they don't succeed in time, Hanne, Marthe, and Julia will be mermaids forever, and never again on K3…