Japanese

超劇場版　ケロロ軍曹２　深海のプリンセスであります！

English

English: 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)