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...
Yeah, so in the final scene where the 
protagonist and the heroine get together,
Sí, la escena final
donde los protagonistas están juntos,
Sí, la escena final
donde los protagonistas están juntos
Du coup, quand le héros
et l’héroïne s’unissent à la fin,
Sì, perciò nella scena finale
in cui il protagonista e l'eroina si riuniscono
Sim, daí na cena final onde o 
protagonista e a heroína ficam juntos,
Ага! И потому финальная сцена,
где главный герой сходится с сестрой