The plot of the film is based on an ancient legend of the Irish and Scottish peoples, according to which there are certain creatures in the world - villages that have a unique ability to turn from seals into people, using a magic skin for this. Once, a village girl fell in love with an earthly man with whom she created a real family. Soon they had a blue-eyed boy who looked like a father whom they named Ben. A couple of years after that, he had a younger sister, Sirsha, who not only looks like her mother, but is also a real village. For six years of her life, the girl never learned to talk, but she had an irresistible craving for the sea. Once she finds her mother’s magic skin and goes to sea, which causes fear in her family, after which they decide to leave the coast and move to live in the city. However, here, far from the sea, Sirshe and Ben find themselves adventures ...