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.
She doesn't have the strength left to turn 
everyone against her like she used to.
Sie hat nicht mehr die Kraft, alle gegen 
sich aufzubringen, wie sie es früher tat.
No le quedan fuerzas para convertir a 
todos a su alrededor en sus enemigos.
No le quedan fuerzas para 
enemistarse con todo el mundo.
Elle n’a plus l’énergie 
pour se battre avec tout le monde.
Ela não tem mais forças para tratar