Doraemon: Nobita and the New Castle of the Undersea Devil (2026)

Disagreeing over where to go camping during summer vacation, Nobita and his friends decide to camp in the middle of the ocean at Doraemon's suggestion! Using their secret gadgets, the "Underwater Buggy" and the "Tekio Light," the five enjoy their undersea camping adventure, encountering various creatures. After discovering a sunken ship, they meet a mysterious young man named El. He turns out to be an "undersea person" who lives in the Mu Federation, which spreads under the sea! The undersea people hate people on land and cannot trust Nobita and his friends. Then they receive news that "Devil's Rock Castle...has begun to move!!" What exactly is this "Devil's Rock Castle" that the undersea people fear...? With faith in their friends, they set off on a great adventure that will determine the fate of the Earth!