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.
Is Doraemon: Nobita's Great Battle of the Mermaid King on Netflix? Yes! The movie Doraemon: Nobita's Great Battle of the Mermaid King is now on Netflix in the countries listed below.
| Writing | Fujiko F. Fujio | Original Story |
| Directing | Kōzō Kusuba | Director |
| Sound | Kan Sawada | Music |
| Writing | Yuichi Shinbo | Writer |
| Visual Effects | Hiroshi Shimizu | Key Animation |
| Visual Effects | Yuu Yamashita | Key Animation |
| Visual Effects | Akiko Matsuo | Key Animation |
| Visual Effects | Takeshi Yamazaki | Key Animation |
| Visual Effects | Takayuki Gotan | Key Animation |
| Visual Effects | Maziro | Key Animation |
| Visual Effects | Shingo Okano | Key Animation |
| Visual Effects | Dai Suzuki | Key Animation |
| Visual Effects | Osamu Ohkubo | Key Animation |
