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