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.
I hear you got a new teacher.
Ich hab gehört, du hättest 
einen neuen Lehrer.
Escuché que tienes un nuevo maestro.
Me han dicho que tienes un nuevo maestro.
Il paraît que tu as trouvé 
un nouveau professeur ?
Ouvi dizer que você tem
 um professor novo.