Fuka wanders off to Okinawa after quitting her idol job in Tokyo. There, she meets Kukuru, who is the director at Gama Gama Aquarium.
Fuka finds out why Kukuru is working so hard to keep the aquarium running. She’s asked to feed the penguins for an event, but things don’t go quite as planned.
With Grandpa out of town, Kukuru and Fuuka work together to feed and weigh the penguins. Kukuru notices something wrong with one of the penguins, and decides to call the vet, who is on maternity leave.
The touch pool, where people are invited to touch sea creatures with their own hands, is the biggest event of the summer at Gama Gama Aquarium. Kukuru, Kai, Kuuya and Fuuka are hard at work to prepare.
Fuuka’s mother comes to Gama Gama Aquarium to take her home, but she isn’t ready to leave just yet.
Kukuru and the crew brainstorm for ways to attract more visitors to Gama Gama Aquarium. They decide to try selling some sweets.
With shaved ice a success and new visitors drawn to Gama Gama Aquarium, Kukuru’s grandfather insists that the crew take a break.
Karin finds a venue for a traveling aquarium at the pediatrics ward of the local clinic. The head nurse there has a fear of crabs.
Haebaru Chiyu is at Gama Gama Aquarium from Aquarium Tingaara to study how they do things, but she butts heads with Kukuru.
With the Gama Gama Aquarium soon to be closed, Kukuru is desperate to find ways to keep it afloat. She tries to figure out a way to market the illusions that people had been witnessing there.
A typhoon approaches as Kukuru locks herself inside Gama Gama to protest its closure.