When Nobita feels like diving in his hometown, 도라에몽 uses Underwater 펌프 Simulator (架空水面シミュレーター・ポンプ?) to 펌프 all the water to fill up water. That night, 도라에몽 and Nobita use a Diving Mask Simulator to dive underwater. Later on, lots of fish, and a 상어 attack 도라에몽 and his friends. So, 도라에몽 puts a stop on the Underwater 펌프 Simulator, but there is a girl named Sophia, lay down on the bushes in his town.