In Another World with My Smartphone, Vol. 10 (manga) — Patora Fuyuhara

As the proud owner of a new castle, Touya has a lot of work to do before his kingdom is ready, and hosting a party for the rulers of the Western Alliance countries is first on the agenda! From there, the new king finds himself inundated with visitors, with some looking to do business, others seeking citizenship, and even some wayward Phrase trying to wreak havoc! Can Touya rise to the challenge and become the leader his citizens need?