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.
Seeing someone like that just 
kind of soothes the soul, you know?
Jemanden so wie eben zu sehen
 besänftigt die Seele, weißt du?
Siempre es agradable cuando lo ves así...
Pero es agradable verlo así...
Ça me rend nostalgique 
de voir ça.
Dá uma sensação tão
 boa de te ver assim...