Hakushaku Reijou wa Kenen no Naka no Elite Kishi to Kyousei-teki ni Tsugai ni Saserareru

When the Principality of Arita was conquered by the Skinia Empire, the children of the nobility were taken to be educated at the empire's academy. When they reach 18 years of age, they will be paired off in arranged marriages to ensure assimilation into the empire. And so the countess Tiana was pair...

Source: MyAnimeList