This is a fantasy in which the mermaid Pipy goes off on a host of adventures with the sea turtle Gabo and the prince of a machine-controlled island named Engilin, who appears as a car. Dr. Lehman researches the process of how to transform man into mermaid, projecting that land areas would be overcrowded with humans in the near future. He uses his newborn son for his experiment, turning him into a mermaid. Lehman is imprisoned together with his wife for the presumed murder of his son. In the meantime the son who had fled into the sea is saved and brought up by a friendly turtle, and given the name Pipy. Pipy embarks on various adventures with his sea turtle friend Gabo, who was brought up together with him.
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