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.
You're from Iwazu, so you come 
to school by train, right?
Du bist aus Iwazu, 
also kommst du mit dem Zug, oder?
Eres de Iwadzu, así que 
seguro vienes en tren, ¿no?
Eres de Iwadzu, así que supongo que 
vendrás en tren, ¿verdad?
Comme tu habites à Iwazu, 
tu bénéficies du transport scolaire.
Você é de Iwazu, então vem
de trem para o colégio, sim?