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 ignoring that I'm the one 
on the student committee.
Du ignorierst, dass ich derjenige
 aus dem Schüler-Komitee bin.
Yo soy el que está en el comité.
Soy yo quien está en el comité.
moi, le délégué 
du comité d’organisation ?
Eu que sou do comitê de alunos.