Namaiki na Imouto no Shitsukekata | 生意気な妹の調教法

I have a younger sister that is not cute. If you say accurately, it is lovely only the appearance, it is amazing impudent, it is a younger sister with an irritated word only. However i decided it, like this younger sister it tries to discipline and change it into a lovely younger sister.

If you are an older brother, how do you train the younger sister that is impudent?