Kage no Eiyuu no Chiyugakari

Under normal circumstances, the servant girl Nanna would never cross paths with the war hero known as the "Shadow Hero." However, he has an incurable disease, and Nanna has the power to cure it. There's just one catch–Nanna can only heal her patient by losing her virginity to him! Can the two of them possibly enter such an intimate arrangement?!

(Source: Seven Seas Entertainment)