Ep. 12: Coco invites Lucia, Hanon, and Rina to the Indian Ocean to find the Legendary Spiral Shell.
Aired on June 19, 2004

12
Coco invites Lucia, Hanon, and Rina to accompany her to the Indian Ocean in order to assist in the search for the Legendary Spiral Shell. The narrative reveals that the shell belonged to Sara and contained all of her memories. Consequently, the group consisting of the four girls and Hippo engages in a conflict against the Black Beauty Sisters to secure possession of the item. This confrontation centers on the retrieval of the shell and the preservation of the memories it holds.
Episodes
- Ep. 8 · Lucia and friends help Kaito regain memories through surfing and a mermaid appearance
- Ep. 9 · Hanon learns piano with Nagisa and Kaito while Lady Bat appears.
- Ep. 10 · Rina travels to the North Atlantic Ocean for a ceremony and misses Masahiro.
- 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