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.
The sports teams looked like that 
noise was driving them crazy.
Die Sportteams sahen aus, 
als würde sie dieser Lärm wahnsinnig machen.
Parecía que ese ruido le haría explotar 
la cabeza a los equipos deportivos.
Ese ruido podría haberle hecho explotar 
la cabeza a los de los clubes deportivos.
C’est quoi, ce boucan ?
O pessoal dos clubes de esportes parece
estar com dor de cabeça por isso.