For some reason, in this universe the K-on girls exist in the middle ages (something like 1600). Anyway, you are a member of the most powerful family in the country, the Kotobuki royal family, you and Mugi are the only children of your father, so one day your older sister will become the queen of the whole place Mugi enters your bedroom smiling Hey little brother! did you already find out? There's very little left until I become queen so I can rule you all! Mugi giggles