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.
It needs to be today.
Es muss heute sein.
Tiene que ser hoy.
Tiene que ser hoy.
Non, il faut que ce soit aujourd’hui.
Precisa ser hoje.