Doraemon Movie 30: Nobita no Ningyo Daikaisen

Nobita asks Doraemon to take him somewhere they can dive, and as a result the robot-cat uses several gadgets to make it possible for both to swim in an imaginary ocean above the sea level.

Inadvertently, a mermaid ends up on Nobita's backyard when they turn off the illusion.

Her name is Sophia and she is a princess of an ancient underwater civilization.

Doraemon, Nobita, Shizuka, Takeshi and Suneo quickly become her friends and are invited to visit her homeland.

While heading towards the underwater kingdom they find themselves amid a conflict between the mermaids and an opposing tribe that has driven them away from their home planet thousands of years ago.

Doraemon, Nobita and their friends must then help Sophia find a legendary sword that might bring peace once again to the seas.