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...
If I'd known Kazusa was leaving, 
I would've done the same thing.
Hätte ich gewusst, dass Kazusa uns verlässt,
 hätte ich auch so gehandelt.
De haber sabido que Kazusa se iba, 
hubiera hecho lo mismo.
De haber sabido que Kazusa se iba, 
yo habría hecho lo mismo.
Si j’avais su 
qu’elle allait partir,
Se eu soubesse que a Kazusa estava indo
 embora, teria feito a mesma coisa.