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...
A little blizzard like this can't 
rip apart our bond as siblings!
Dieser mickrige Schneesturm wird unser
geschwisterliches Band niemals zertrennen!
¡Una pequeña tormenta no puede
romper nuestros lazos como hermanos!
¡Una pequeña tormenta no puede
romper nuestros lazos como hermanos!
Un piccolo tornado come questo non potrà mai
spezzare il nostro legame fraterno!
Uma nevasca boba dessas não 
irá abalar nosso laço fraternal!
Какой-то захудалой вьюге
не разлучить меня с сестрой!