Violet no Hanayome ~Maou-sama to Seiryaku Kekkon Shita Hazu ga Sekaiichi Shiawasena Ouhi ni Narimashita~

Because of the truce of the Demon Stone War that had broken out between the human country “St. Wood” and the demon tribe country “Navis”, the first princess of “St. Wood”, Sumire, who was oppressed by the royal family because of her lack of magical power, was married as a sacrifice to the demon tribe king Zion, who was feared for his ferocity...
However, life in “Navis”, the land of the demons, was the beginning of a happy married life full of love...?