Apocalypse Bringer Mynoghra, Vol. 2 (manga)

There's no better cheat code than experience. Reborn into the fantasy nation management game he'd mastered in the real world, Takuto and his loyal hero unit, Atou, set out to build the evil nation of Mynoghra into a fearsome empire. With the Dark Elves now under their control and the first settlement well underway, things were going rather smoothly- until the good-aligned holy kingdom took notice. Can Takuto confront this continental superpower. Or will it be game over for the infant nation of Mynoghra.