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.
Then this'll be the last time 
I give up just because you ask me.
Dann ist dies das letzte Mal, dass ich aufgebe,
 weil du mich darum bittest.
Entonces esta es la última vez 
que me rindo porque me lo pidas.
Entonces, esta será la última vez 
que me rinda porque me lo dices.
dans ce cas, c’est la dernière fois 
que je m’incline si gentiment.
É a última vez que vou
desistir só porque você pediu.