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.
So, here's how to fill these out...
Okay, nun sage ich dir, 
wie man sie ausfüllt.
Entonces, te diré cómo llenarlas—
Entonces, te diré cómo rellenar...
Très bien, alors je vais te montrer 
comment remplir les formulaires.
Então, o preenchimento é assim....