Chevalier ~Saikyou Kishi Reijou wa Kowamote Outaishi no Dekiai ni Konwaku Suru~

Because Garnet was an illegitimate daughter of a viscount family on the brink of ruin, she had many miserable experiences since her early childhood. Garnet vowed, "One day, I'll show them all!" and entered the order of knights. She then became the strongest knight in the country. However her home, the country she lived in, could not acknowledge a female advancing through the ranks. Invited by her childhood friend and prince of a neighboring country, Garnet planned on leaving her home country behind in order to get ahead in her career. However, for some reason Gillford- the prince and leader of the knights of her home country- prevented her from leaving and declared, "I won't give you away, anywhere!" Garnet was baffled by him suddenly wanting to bed her and by his doting on her... [Translation of DL Site page synopsis]