On his island, the little fisherman is used to catching just one fish and sharing it with his family. But one day, he is tempted to start a business. He makes bigger and bigger nets, then builds a fish canning factory. Soon, even the seagulls have nothing left to eat!
Banished by the Crab King, the little fisherman must leave his island and set sail for other shores. He meets a fishing people who treat the sea like a garden. These new friends give him some advice, some seaweed, and a few fish to restore life to the ocean depths around his island.