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...
I'm sorry for barging in.
Entschuldige, dass ich so hereinstürze.
Perdona... por entrar sin permiso.
Siento entrar sin permiso.
Pardon d’être entrée 
sans frapper…
Desculpe por entrar sem avisar.