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.
We'll allow Touma-san to 
advance to the next grade,
Wir werden Touma-san genehmigen,
in die nächste Klassenstufe zu wechseln,
Permitiremos que Touma-san pase al próximo 
año, pero la sacaremos de la especialidad.
Vale, que Touma-san pase de curso, 
pero no estará en la especialidad de Música.
Je note donc que l’école accepte 
le passage de Kazusa Tôma,
Então vamos deixar que a
 Touma passe de ano,