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.
And you're going to tell her that you'll be 
living with your mother starting next month.
Und du wirst ihr sagen, dass du 
ab nächsten Monat bei deiner Mutter leben wirst.
Y le dirás que el próximo mes 
te irás a vivir con tu madre.
Y le dirás que, el mes que viene, 
te irás a vivir con tu madre.
Ça sera l’occasion 
de lui annoncer directement…
E você vai dizer para ela que
 a partir do mês que vem