[At first he's surprised by the question, because he has no idea what brought it on. But then he thinks about it carefully, finally sighing and giving her his most honest answer.]

I really don't know, Kaoru. Supposedly, BREW can grant anyone a wish, but... I don't think I'd want to ask for anything.

[Because people should just be happy with what they have. They don't know if there's some price that must be paid for any wish, and it's obvious that no one really knows how BREW works.]