Ep. 15: Lucia, Hanon, and Rina travel to Antarctica to stop a melting iceberg and tsunami threat.
Aired on July 10, 2004

15
Following recent events in Antarctica, Caren becomes worried and sends Lucia, Hanon, and Rina to investigate. They discover that something is causing an enormous iceberg to melt, a process that could trigger a tsunami capable of affecting the entire globe. The mermaid princesses must utilize all their strength to prevent this global disaster caused by Michel. Meanwhile, Caren experiences a romantic development when she finds love with a glaciologist named Subaru. The group works to address the environmental threat while personal relationships evolve amidst the crisis.
Episodes
- Ep. 11 · Lucia, Hanon, Rina, Kaito, and Michal spend time shopping together in town
- Ep. 12 · Coco invites Lucia, Hanon, and Rina to the Indian Ocean to find the Legendary Spiral Shell.
- Ep. 13 · Hanon and Rina encounter Masahiro at an ice cream parlor, leading to curiosity about his background.
- Ep. 14 · Kaito Remembers His Past While Gaito's Spirit Appears and Lanhua Is Introduced
- Ep. 15 · Lucia, Hanon, and Rina travel to Antarctica to stop a melting iceberg and tsunami threat.
- Ep. 16 · Mermaid Princesses Team Up for Beach House Competition and Volleyball Match
- Ep. 17 · Nagisa loses celebration tickets and takes Hanon by boat to the event
- Ep. 18 · Mermaid Princesses encounter a magical world granting simultaneous wishes
- Ep. 19 · King Somegorō Seeks Mermaid Princesses Aid Against Black Beauty Sisters