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...
For now, we're relying on the 
powers of the great kotatsu,
Dem allerheiligsten Kotatsu sei Dank erfrier
ich nicht, aber Arbeiten kannst so knicken.
Por ahora, confiaremos
en el poder del brasero,
Por ahora, confiaremos
en el poder del brasero,
Je survis grâce
à ma vénérée table chauffante,
Per ora ci dobbiamo affidare
agli impareggiabili poteri del kotatsu,
Por hora, podemos contar com o ótimo 
kotatsu, mas não consigo trabalhar assim.
А пока великий и ужасный котацу
тихо-мирно греет нас…