How to Build a Magnificent Nation Subarashiki Kokka no Kizukikata

Based on the erotic doujin game by Iris Field (アイリスフィールド).

Ariadne just became the princess of the small country Avon. But already it’s in a deep financial crisis. In an effort to save the country she declares that Avon must focus on developing their sex industry.

(Source: DLsite, translated)