Haruki hears about Kazusa's moving from her mother, who she hadn't been on good terms with.  He feels betrayed and angrily confronts her.  But his words force open the door to Kazusa's heart, which she had desperately tried to keep closed so that the three of them could stay together.
Are you really the 
Kazusa Touma I admired?
Bist du wirklich die Kazusa Touma, 
die ich bewundert habe?
¿De verdad eres la Kazusa Touma que admiro?
¿De verdad eres la Touma 
Kazusa a la que admiro?
Cette fille si classe 
que je connaissais ?
É mesmo a Kazusa Touma que eu admirava?