Easygoing Territory Defense by the Optimistic Lord: Production Magic Turns a Nameless Village into the Strongest Fortified City | GOGOAnime

Synopsis:

Van, the fourth son of a powerful nobleman, is just two years old when he remembers his past life as a wage laborer in Japan. With his mature brain in a young body, he’s considered a pretty cool kid… until he turns eight, when he demonstrates his mastery of “Production Magic.” In a family that favors offensive magic, this craft is deemed useless in battle, and Wang is exiled in disgrace to oversee a small rural town. With only his personal servant, the memories of his past life, and his “worthless” magic, can Wang improve the fate of this small village and himself?