Based on the erotic game by Tunnel No.73.

Lunalie, the female knight of a royal princess guardian, has been framed for the kidnapping of the princess. Allegedly, the princess was sold in slave trade. Luna rushed out to find information about the princess in the slave trade city, but the price of an information was very expensive. She is willing to sell her body and virginity just to find the information. It turned out that it was just a trap that made her a slave. Then, what will Luna do? Can she save the princess?

(Source: Nekopoi, translated)