Megami Ryoujoku ~Koukou Souryo Skuld~

Skuld is an oracle. One day, her country is invaded by monsters and Skuld is kept hostage by them. Roki says, "Follow my orders if you don't wanna die." Her power will disappear if she loses her virginity.... "Ok, you entertain me with your another 'hole'...." [From [url=https://web.archive.org/web/20090228211117/http://www.erogeshop.com:80/product_info.php/products_id/1012146]Eroge Shop[/url]]