"Kukuru Misakino è una ragazza del liceo che ama le creature marine. La sua testa è piena di pensieri sull'acquario Gama Gama, di cui è direttrice ad interim. Per proteggere l'acquario, che si sta avvicinando alla sua fine, lavora duramente anche durante le vacanze estive. Dall'altra parte, Fuuka Miyazawa, che ha lasciato il suo lavoro di idol, arriva a Okinawa senza sapere dove sta andando, ma viene guidata all'acquario Gama Gama da Karin Kudaka, un membro dell'associazione turistica, che passa di lì per caso. Quando Fuuka sperimenta qualcosa di strano davanti all'acquario, Kukuru le chiede: "L'hai visto poco fa?

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 Tingarla 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.

It’s Gama Gama Aquarium’s last day, and it’s receiving a lot of visitors. The staff are hard at work to make it memorable.

A year has passed since Gama Gama closed, and Kukuru has found work at Aquarium Tingarla. But for some reason, she’s assigned to Marketing.

Fuuka has returned to Okinawa to find a dejected Kukuru, struggling to do well at work.

Kukuru is tasked with coming up with ideas for an event, but her proposal comes with some serious challenges.

A penguin egg is about to hatch at Tingarla. The penguins team is set to stay the night at the aquarium, but Chiyu can’t make it, so Kukuru offers to take her place.

It’s been a while since Kukuru and Fuuka had the same day off, so they host a get-together with their coworkers.

Akari comes up with an idea for an event at the aquarium, but she doesn’t seem to be particularly enthusiastic. Kukuru wants to change that.

Aquarium Tingarla is visited by a TV crew who is there to document a penguin hatchling’s growth. Fuuka wants to turn down her opportunity to be on TV again.

A dolphin is lost in the waters near Tingarla. Kukuru is eager to check up on it, but she is busy preparing for an upcoming project proposal, so the staff take turns visiting the dolphin.

With work not going smoothly and having seen Gama Gama demolished, Kukuru leaves work to go to the sub-islands.

Having watched the sea turtle hatchlings, Kukuru returns to Tingarla with a renewed sense of purpose, and resumes work on the wedding venue project.

The director announces a new research facility to be built at Tingarla. Two people will be chosen to study at a similar facility in Hawaii.

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