Doraemon: Nobita's Great Battle of the Mermaid King

Original title: 映画ドラえもん のび太の人魚大海戦

Directed by Kōzō Kusuba

Nobita, Doraemon, and the rest must come to the aid of mermaid princess Sophia, whose undersea kingdom is suffering under the weight of a war. Their only hope lies in a mythical sword from the planet Aqua...