Aoki tells Yushi that he must be suffering without his parents, even though he isn't.  She has good intentions, but Yushi is frustrated by her inability to see who he really is, and insistance that he has to be what she thinks he is.
You probably don't have the money for 
it, unlike an ordinary school book.
لا تملك المال له غالباً بخلاف الكتب المدرسية العادية
Im Gegensatz zu einem
normalen Lehrwerk
A diferencia de los otros libros,
A diferencia de los otros libros,
C’est logique que tu ne puisses pas
t’offrir un tel ouvrage.
Rispetto agli altri testi di studio,
Você não deve ter dinheiro para comprar,
não é que nem um livro qualquer da escola.
На обычные учебники тебе денег хватает, 
а на дополнительные словари, возможно, нет.