Level 99 Adventurer's First Time Managing a Territory

This is a story that takes place after a happy ending. Yuujin Amakusa, a high school student who was transported to the fantasy world of Bluewords, became a great magician and saved the world with his companions. For the sake of the female Holy Knight, Valtrude, who was ennobled for her achievements, he now gets involved in managing a territory. However, problems pile up: a ruined city to be rebuilt, a dwarven village that no longer produces iron, a seaport city that doesn't pay taxes, and villages plagued by monsters. Yuujin, who has become the strongest adventurer in Bluewords, joins forces with his companions to tackle these problems, sometimes using magic, sometimes using modern knowledge, and mostly using his cheat-level funds! Until the day he returns to Earth, one year later.