How a Realist Hero Rebuilt the Kingdom
What is How a Realist Hero Rebuilt the Kingdom about (plot, summary)
"O, Hero!" With that cliched line, Kazuya Souma found himself summoned to another world and his adventure--did not begin. After he presents his plan to strengthen the country economically and militarily, the king cedes the throne to him and Souma finds himself saddled with ruling the nation!