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.
Hey, I see you're enjoying your youth, Haruki.
Hey, wie ich sehe, 
genießt du deine Jugend, Haruki.
Oye, veo que te diviertes, Haruki.
Oye, veo que te diviertes, Haruki.
Salut !
Ei, estou vendo que você
está se divertindo, Haruki.