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The sea demon Daimon, who has long sought to conquer all the sea spaces, may soon achieve his goal. After all, his servants have kidnapped and bewitched the heirs from all the sea kingdoms, except for one, where the supreme fairy Delphi rules. If the villain manages to defeat her, according to the laws of the sea, Daimon, the king of the deep, will become the ruler of the sea, who will have only one heir - his son.

In addition, the demon dispelled the spell of all the sea fairies, and now there is almost no hope left. Many wizards have tried to save the sea world, but they themselves have disappeared without a trace. Now it's up to two twin sisters from the surface and their new friend Levko to take up the task. Will they make it? Will they survive in the treacherous underwater corridors filled with poisonous moray eels, giant octopuses, and formidable wasp jellyfish? Will they have enough strength and courage? Come to the aid of your friends! For children of senior preschool and primary school age.