As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World 3 (manga)

It's brains over brawn in this new isekai adventure! One day when leaving work, a salaryman dies and is reborn in another world as the weak child of the noble Louvent family. Using his "appraisal" skill, which lets him see the stats of others, young Ars Louvent recruits the best people to his side in order to turn his country around. BETROTHEDReincarnated as a child aristocrat in another world, Ars Louvent wastes no time in using his “appraisal” skill to recruit promising talent to his side.

With the swordsman Rietz, the mage Charlotte, and the bookworm Rosell as his new vassals, Ars begins to see real hope of turning his weak domain around. Yet, the flames of unrest are spreading throughout the empire, and Ars now finds himself facing a different kind of flame altogether: his fiancee!