Easygoing Territory Defense by the Optimistic Lord: Production Magic Turns a Nameless Village into the Strongest Fortified City (Light Novel) Vol. 2

Van is hard at work using his past-life knowledge and production magic to enhance his little hamlet in exile. This time around, he's built some beefy ballistae and blasted a forest dragon! Soon the king himself is swinging by for an impromptu royal visit, and a newly discovered dungeon has adventurers flooding in. With all this hustle and bustle revitalizing the village, there's no way things could take a turn for the worse...right?!