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