The Oath to the Sea! Minami's Most Important Treasure! is the 16th episode of Go! Princess Pretty Cure, and the 551st episode of Pretty Cure overall.
The girls visit Minami's brother's resort.
Tropes:
- Friendly, Playful Dolphin: Tina the dolphin, who loves to play with Minami.
- Luminescent Blush: Haruka and Kirara blush when they see Wataru.
- One-Steve Limit: Tina's name is one letter off from Hina.
