Doraemon: Nobita's Great Battle of the Mermaid King

Apparently someone needs to save an underwater kingdom. Nobita and friends help mermaid princess Sophia. It involves a sword from another planet somehow.

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Kōzō Kusuba directed Doraemon: Nobita's Great Battle of the Mermaid King in 2010. See Kōzō Kusuba's full filmography, where to start with Kōzō Kusuba, or where to go after you've seen everything by Kōzō Kusuba.

Doraemon: Nobita's Great Battle of the Mermaid King was released in 2010 (JA original-language production), with a runtime of 100 minutes.