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

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.