The Hamelin Pipe

One day, Doraemon is being chased by mice in Nobita's room. At first, to get rid of the mice, Doraemon uses various destructive gadgets, and then, after Nobita's persuasion, he brings out the "Hamelin Pipe." Nobita uses it to drive away the mice and cockroaches, and incidentally sweeps up fallen leaves and moved things from the warehouse to the mountain. But he goes too far, wanting to make money, and ends up moving so many old things to the mountain. Doraemon is furious. Gian tells Nobita to clean his room, so he uses a pipe to drive them away. But later he finds that their trash and furniture are gone, so he gets angry and blows the pipe to send Nobita to the mountain. Doraemon finally manages to get Nobita home by blowing the pipe backwards, but in doing so, he also sends all the things back (including the mice and cockroaches he has previously chased away). Doraemon and Nobita's mother are terrified when they see the rats and cockroaches return, followed by all the items piled up on the hill.