When Nobita feels like diving in his hometown, Doraemon uses a Underwater Pump Simulator to pump all the water out of Tokyo, causing the entire city to go underwater. That night, Doraemon and Nobita use a Diving Mask Simulator to dive underwater. Later on, lots of fish, and a shark attack Doraemon and Nobita. So, Doraemon puts a stop on the Underwater Pump Simulator, but there is a girl named Sophia, lying down on the bushes in his neighborhood.
There are a few ways to watch Doraemon: Nobita’s Great Battle of the Mermaid King online in the U.S. You can use a Doraemon: Nobita’s Great Battle of the Mermaid King streaming service such as Netflix, Hulu, or Amazon Prime Video