Isekai no Binbou Nouka ni Tensei shita node, Renga wo Tsukutte Shiro wo Tateru Koto ni Shimashita

In a different world, the royal family is in decline and turmoil continues.
In a cold village, an infant named Ars has a memory of his previous life where he was passionate about "city-building" games, and starts building houses with his own magic to get out of poverty!
He hatches a rare servant beast, cultivate the land, clear ...