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.
About leaving Japan, 
or about how I felt...
Dass ich Japan verlasse 
oder wie ich fühle ...
sobre irme de Japón o cómo me sentía...
Sobre irme de Japón o cómo me sentía...
Ni de mon départ à l’étranger…
Nem sobre ir embora do Japão,
nem sobre como eu me sentia...