Itsuki, Nayuta, and Miyako have a hard time dealing with the cold and head down to Okinawa. The next day, they visit a remote island so Itsuki can do some research and Nayuta decides to flail around naked in the water. Miyako is awed by what she's seeing and eventually jumps into the water naked, as well. Two days later, Itsuki is invited by his illustrator to go to Hokkaido, where they try various local cuisines. However, Itsuki finds out that Setsuna had been ignoring a deadline...
Sharks are fish, but the eggs are 
fertilized in the female's body.
Los tiburones son peces,
pero los huevos los fertiliza la hembra.
Los tiburones son peces,
pero los huevos los fertiliza la hembra.
Les requins sont des poissons
à fécondation interne,
Gli squali sono pesci, ma le uova
vengono fertilizzate nel corpo della femmina.
Tubarões são peixes, mas os ovos são 
fertilizados dentro do corpo das fêmeas.
Акулы хоть и рыбы, но потомство в себе вынашивают.