FROM LEVELING UP THE HERO TO LEVELING UP A NATION

With the hero's party having grown past the need for his training skills, the protagonist Aega finds himself sacked. In lieu of a cash severance pay, he's granted dominion over the territory of Tokumo. However, his new domain may hide a shocking secret...! (Source: Manga UP! Global) — Description from AniList community (anilist.co).