The plot is getting annoying as h*ll. And what the heck with their guardian??? Even the twins call him as 'the red haired man'. Means, they dont even know their guardian exist. But hey, all this time, why don't he just introduce himself, like: i am your guardian. I think there are a whole lot of time to do it.
And the way the emperor and everyone act is really stiff. I think this is the first time i feel so horrible with the story telling the author has.