Hime Kenshi Estel -Haramase King 2-

There is a paradise for elves deep in the mountains. However, the country is now being invaded by another country. Estel, a princess, visits surrounding countries to look for someone who saves her country. One day, she comes to a country governed by a tyrant. The king soon accepts her offer, but he tells her to marry him in return. Though Estel gets mad, she decides to marry him for her country...