Virgin Knight: I Became the Frontier Lord in a World Ruled by Women (Light Novel) Vol. 1

Reborn from modern Japan into a medieval fantasy realm where chastity norms between men and women are completely reversed, Faust is an anomaly--a rare male knight. Raised as a frontier lord, he clings to his old-world values, often putting him at odds with his new reality. From the queen's barely-there attire to a buxom duchess whose "diplomacy" borders on harassment, navigating court life is a daily trial. But on the battlefield, Faust is a warrior without equal--his skill alone can turn the tide of war.
Now assigned to mentor the fierce yet inexperienced Princess Valiele on her first campaign, Faust embarks on what should be a routine bandit suppression. But upon arriving in a remote village, they are met with an unforeseen tragedy--one that will test his skill, courage, and honor like never before.