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.

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.

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

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.