After Nobita found a egg, he decided to hatch it and named Piisuke. The two have a great bond together from the newborned Piisuke up to Fully-grown Piisuke. In one night, Nobita asks Doraemon to feed Piisuke as he was sick but Piisuke don't accepts Doraemon's food and Piisuke goes to Nobita's house. Piisuke greatly misses him and Nobita asks Doraemon again to return Piisuke into the lake. Later Dorumanstein negotiates with Nobita to sell Piisuke to him as Piisuke trusts humans. Nobita disagrees and he will return Piisuke on his own era.