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.
How can we be friends if I can't even 
say the things I want to say to you?
Wie können wir Freunde sein, wenn ich dir 
nicht mal sagen kann, was ich sagen will?
¿Cómo podemos ser amigos si no 
puedo ni decirte lo que quiero?
¿Cómo podemos ser amigos si ni 
siquiera puedo decirte lo que quiero?
Tu considères comme un ami quelqu’un 
qui n’arrive pas à te dire ce qu’il pense ?
Como podemos ser amigos se nem
consigo falar o que quero para você?