Conqueror from a Dying Kingdom (Manga) Volume 3

Yuri Ho wanted nothing but a peaceful life, but now a future as a military commander and provincial ruler seems unavoidable. Following his humiliation of a political rival to ensure his father would become the head of the Ho family, it's assumed that the father is merely keeping the seat warm for his son. Now at just ten years old, Yuri has to prepare himself for his impending great responsibilities by attending the Knight Academy-a prestigious school where anyone seeking to serve as a military officer in the Shiyalta Kingdom must train. As Yuri attempts to navigate the academy's odd systems and strange traditions, he soon encounters the kingdom's first princess, Carol Flue Shaltl. Strong-willed and principled, she takes offense to Yuri's apathy and makes herself his rival, much to his dismay. But when Yuri is center of attention in a school of would-be warriors, his run-in with Princess Carol is far from his last violent encounter.