At last, Haruki sleeps with Kazusa.  Her wish finally comes true, and she prepares to leave for Europe. Haruki takes Setsuna to the airport, hoping that they can all be together once again.  When the three are reunited, everyone remembers the best moment of their lives: the last song they sang at the school concert.  The title of the song was...
What do I have to do
Was muss ich tun,
¿Qué debo hacer
¿Qué debo hacer
Comment faire 
pour que mon cœur
O que preciso fazer