And it should be noted that, despite the large number of magical academies in anime (which I am aware of, although in most cases I don't know the synopsis), this still does not serve as proof that Hogwarts is not one of the most powerful inspirations for this phenomenon. If such a thing (and specifically with a European flavor, with all these sweaters, plaid skirts, etc.) existed in anime before the Harry Potter books, then I would agree. Otherwise, it sounds rather weak.
And it should be noted that, despite the large number of magical academies in anime (which I am aware of, although in most cases I don't know the synopsis), this still does not serve as proof that Hogwarts is not one of the most powerful inspirations for this phenomenon. If such a thing (and specifically with a European flavor, with all these sweaters, plaid skirts, etc.) existed in anime before the Harry Potter books, then I would agree. Otherwise, it sounds rather weak.