Another Kiruru appears in the South Pacific, but it was defeated by two unknown entities that look like Keronians, with subtle differences. Meanwhile, Keroro and the gang goes for a trip sponsored by Momoka to a private island. There, an alien named Meru, who claims himself as the prince of the deep sea, captures them, and aims to make Natsumi his princess, and that they had captured Keroro, who pleads to them to assist the Keroro Platoon, only to be kicked out.
Unfortunately the movie Sergeant Keroro The Super Duper Movie 2: Deep Sea Princess is not yet available on HBO Max.
| Visual Effects | Shinya Uchida | Key Animation |
| Visual Effects | Toshiyuki Komaru | Key Animation |
| Visual Effects | Makoto Yamada | Key Animation |
| Writing | Masahiro Yokotani | Screenplay |
| Visual Effects | Fumitoshi Oizaki | Character Designer |
| Visual Effects | Hatsue Nakayama | Animation Director |
| Visual Effects | Miyuki Matsumoto | Key Animation |
| Visual Effects | Kayo Daibou | Key Animation |
| Visual Effects | Yasuzo Iino | Key Animation |
| Visual Effects | Hitomi Takechi | Key Animation |
| Visual Effects | Koji Sugiura | Key Animation |
| Visual Effects | Takayuki Uragami | Animation Director |
| Visual Effects | Satoshi Koike | Animation Director |
| Visual Effects | Masahiko Itojima | Animation Director |
| Visual Effects | Susumu Mitsunaka | Key Animation |
| Visual Effects | Yoshinobu Ando | Key Animation |
| Art | Susumu Yamaguchi | Storyboard Artist |
| Visual Effects | Minoru Okabe | Key Animation |
| Visual Effects | Hiroko Oguri | Key Animation |
| Visual Effects | Morifumi Naka | Animation Director |
| Visual Effects | Hitomi Takechi | Animation Director |
| Visual Effects | Susumu Mitsunaka | Animation Director |
| Visual Effects | Masahiko Itojima | Key Animation |
| Visual Effects | Ryuji Shiromae | Key Animation |
| Visual Effects | Fumitoshi Oizaki | Supervising Animation Director |
| Visual Effects | Sejoon Kim | Key Animation |
| Visual Effects | Hiroshi Iijima | Compositing Artist |
| Directing | Junichi Sato | Director |
| Directing | Susumu Yamaguchi | Director |
