Doraemon: Noby's Underwater Demon Castle

The summer vacation is approaching, and everyone is arguing about where to go for camping. Noby and Shizuka want to go to the beach, while Pijama and Suneo prefer to go hiking. In the end, they decide to go to the underwater mountain with Doraemon's advice. When they arrive at the underwater mountain, they meet the underwater people, and learn that Atlantis is about to be activated due to the underwater volcanic activity. If the Atlanteans launch the "Devil's Arrow", the world will be destroyed. Determined to stop this sinister plan, Noby and his friends decide to head to the Bermuda Triangle to prevent the Devil's Arrow from being launched.