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Sergeant Frog Movie 2
Keroro Gunsou Movie 2: Shinkai no Princess de Arimasu!, Chou Gekijouban Keroro Gunso 2: Shinkai no Princess de Arimasu!, Sergeant Keroro Movie 2: The Deep Sea Princess Let it be so!, 超劇場版 ケロロ軍曹２ 深海のプリンセスであります！, Sergeant Frog Movie 2
During a vacation Natsumi is visited by a female alien and male alien who she later gains feelings for from the ocean that makes her the Deep Sea Princess who, along with the rest of the Keroro Platoon, encounter many dangers summoned by a mysterious creature. (Source: Wikipedia)