A goldfish sneaks away from home and floats off on the back of a jellyfish. After getting stuck in a glass jar, she drifts to the shore where she is freed by Sousuke, a five-year-old boy who lives with his mother Lisa in a house by the sea while his father Koichi works on a fishing boat. After healing a cut on Sousuke's finger by licking it, the goldfish is named Ponyo by her new friend. Unknown to Sousuke, Ponyo already has a name and a family. Her father Fujimoto, a sorcerer who forsook his humanity to live underwater, searches frantically for his daughter Brunhilde. When found and captured, Ponyo rejects her birth name and declares that she wants to become a human. Using the power received from Sousuke's blood, she grows arms and legs and escapes to the surface once more. But the magic released into the ocean causes an imbalance in nature, causing the Moon to start falling out of orbit and the tides to grow dangerously stronger. Reunited with Ponyo, Sousuke must pass an ancient test to restore order in the world and let his companion live on as a human. A lonely little boy named Sousuke lives with his mother by the sea, flashing messages across the water to his father's boat. One day, amid the detritus brought in with the tide, he stumbles upon a little goldfish. Delighted by this strange new friend, he takes her home and names her Ponyo. Sousuke comes to learn, however, that Ponyo is no ordinary fish. A visit from a strange man brings with it fantastical happenings that lead Sousuke and Ponyo on an enlightening adventure.