A beach vacation turns into an adventure when Chibi-Usa runs off and finds a baby plesiosaur near a volcanic island on the verge of eruption.
Tropes in this episode include:
- Beach Episode: The girls and Chibi-Usa join Rei on her beach getaway.
- Breather Episode: This is the only R episode to not feature the Black Moon.
- I Do Not Like Green Eggs and Ham: Chibi-Usa refuses to eat the fish Mako prepares for lunch, but when Giraffe brings a hungry Chibi-Usa some fish, she realizes she has no choice but to eat it, and ends up liking it.
- It's All My Fault: When they can't find Chibi-Usa and start to worry that she may have been eaten by sharks, Rei starts to blame herself for scolding Chibi-Usa, though Mako also blames herself for not bringing anything that Chibi-Usa likes to eat.
- Mama Bear: When the cave starts crumbling around Giraffe, his mother shields him with her body despite that they'll both be crushed.
- Not So Above It All: When Rei insists that she only came to the island for spiritual training, the cats find her swimsuit in her suitcase.
- Picky Eater: Chibi-Usa throws a tantrum when being served fish for lunch after Rei scolds her for being picky.
- Threatening Shark: After the tide carries Chibi-Usa out to sea, she is very nearly eaten by sharks until being saved by the baby plesiosaur.
- Was Too Hard on Him: Rei wonders this after Chibi-Usa storms off because she refused to eat fish.
