Tsuihou Seijo wa Juujin no Kuni de Tanoshiku Kurashiteimasu: Jisaku no Kusuri to Oishii Gohan de Hitojichi Seikatsu mo Kaiteki desu!?

After her younger sister stole her fiancé and broke off the engagement, Saint Lana was forced to marry into the Beastman Kingdom as a sort of hostage. Marrying into a country that doesn't view humans kindly, she braced herself for a life of cold treatment, but what awaited her was a comfortable life...

Source: MyAnimeList