Marina, Aqua and Oceana are brave pirates, always ready to help. They live on the wonderful ship “Ryushechka”, which they manage themselves. The girls bravely swim the seas, dive to unimaginable depths and even dive underwater on a magical submersible. They also know a lot about fashion. Satin dresses, jewelry made from shells and, of course, unusually stylish blindfolds, like real pirates! In the Littorina Lagoon, where the Pirates in Skirts live, the long-awaited Summer Fair is to take place, where you can buy not only various goodies, but also fashionable accessories. But suddenly, sea fairies fly to the ships standing in the lagoon, sprinkle all the pirates with shiny blue-green powder, and they begin... to hiccup. It seems that some kind of terrible spell was cast on them. Marina, Aqua and Oceana must help their friends. But here’s the horror - for this you need to go to the ominous Black Pool, where the fairies of the western seas live...