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 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.