Fuka wanders off to Okinawa after quitting her idol job in Tokyo. There, she meets Kukuru, who is the director at Gama Gama Aquarium.

Kukuru and the crew brainstorm for ways to attract more visitors to Gama Gama Aquarium. They decide to try selling some sweets.

Aquarium Tingarla is hard at work preparing to carry out the aquarium wedding project that Kukuru spearheaded.