[Kuroinu Gaiden] In'yoku no Daishoukan

The Seven Shield Alliance was once formed to oppose the vicious Dark Elven Queen Olga.
The nation of desire - the nation of service - was founded by swallowing all its allies, including the High Elves, the beautiful knights, the priestesses of the Eastern Kingdom, and the Dark Elven Queen, who was the main culprit.

"All women who belong to the nation are obligated to perform sexual service."

As the founding declaration of the nation proclaimed, every woman in the Nation of Service was to be subjected to and responded to every desire of men.
Rumors of this attracted men from all over the continent, and the nation of service became very prosperous.

Then, half a year after the founding of the nation.
Six months after its establishment, Volt, the king of the Service Nation, gave his chief of staff, Keane, an order "The prostitute who will become the symbol of the Service Nation will be the king's daughter.

Create a brothel that will become the symbol of the Service Nation.

Upon receiving the king's order, Keane immediately sets out to gather women to serve as prostitutes.

[Edited from DMM Games]