Rosalind, the 34-year-old greatest knight of the empire who loves dirty novels so much. With her goddess-like physique, sharp swordsmanship, charisma, and excellent tactics, she is praised as a noble knight of the empire, but was it because people found that part burdensome? Rosalind was still a virgin... Thanks to that, Rosalind relieved her loneliness through dirty novels - so-called popular novels. However, one day, she is ordered to subdue a barbarian tribe that has gathered and expanded its forces on the eastern front, and while carrying out her mission, she gets caught up in the barbarian tribe's scheme and is taken prisoner...