Once upon a time, there was a little crab. The crab lived in an icy sea. The crab had many friends. They liked to play all day.
One day, the crab met a big fish. The big fish was sad. The crab asked, "Why are you sad?" The big fish said, "I lost my toy." The crab wanted to help. The crab said, "I promise to find your toy."
The crab looked for the toy. It asked its friends to help. They looked under rocks and in the sand. At last, they found the toy. It was under a big shell.
The crab gave the toy to the big fish. The big fish was very happy. It said, "Thank you, crab. You kept your promise." They became good friends and played together in the icy sea.
