A plane crashes in the sea. A dolphin (white) with its mother (Nana) finds a human baby (Dolphin Boy) in the sea and they take care of him. Finally, the Dolphin Boy grows up and after realizing that he is a human, he leaves the sea and goes to the island in search of his mother. He is guarded by Captain Pearl. Dolphin Boy participates in pearl collecting competition. He is kidnapped by pirates working for "Bibizar".