The Great Tiger Kingdom of Haan, the Gran Chaos Empire, and the Maritime Alliance headed by the Kingdom of Friedonia compete with one another in a newly tripolar world. Suddenly, the Spirit Kingdom of Garlan, home to the high elves, attempts to make contact with these three great powers. They desire to regain the land they lost in the expansion of the Demon Lord's Domain. Souma, however, refuses to help them, seeing no benefit in doing so. Meanwhile, the Great Tiger Kingdom accepts their request and sends troops. Things soon take a downturn as a crisis unfolds; healthy soldiers are collapsing one after another. It turns out that a deadly disease known as the Spirit King's Curse has been running rampant in the Spirit Kingdom! In the face of a novel disease that could threaten the whole world, Souma introduces new policies no one has ever seen before! Here comes volume fifteen of the revolutionary administrative fantasy series!

With Souma's defeat of the giant monster that menaced the Nine-Headed Dragon Archipelago, the people of the Kingdom celebrate his achievement. However, as far as the rest of the world is concerned, someone else has done something even greater—reclaim a piece of the Demon Lord's Domain. That is what Fuuga, King of Malmkhitan, has accomplished. Within the Union of Eastern Nations, Fuuga's power and influence rapidly expand. Unable to accept this encroachment, the anti-Fuuga faction launches an unsuccessful attempt on his life. This sparks all the nations of the Union to be drawn into a massive conflagration?! When this conflict ends, the world will move on to a new stage. Here is volume fourteen of the revolutionary administrative fantasy series!

Restructuring an entire government is exhausting work. But despite an agenda of rest and relaxation, Souma's day off with the girls provides anything but: rebelling retainers, natural disasters, and the threat of war all await. Can Souma keep up without succumbing to the stress?

"Starting today, I will formally become the king of this Kingdom of Friedonia." Having returned from the Union of Eastern Nations and rested awhile, the ceremony that will turn Souma from a provisional king to the true king is rapidly approaching. Because Souma's marriage to his fiancées is to be held on the same day, the capital gets more lively than ever! Meanwhile, using his own marriage as an impetus, Souma encourages his retainers to get married, too. Those who are already engaged to be married, those who aren't ready to be husband and wife yet, those who haven't even recognized their own love—Souma shows concern for all his retainers' different circumstances... The revolutionary administrative fantasy series, volume ten!

 My retainers are my strength. With a massive number of monsters appearing in a "Demon Wave," the group of small to medium-sized countries known as the Union of Eastern Nations faces a crisis. During a conference with Empress Maria of the Gran Chaos Empire, Souma is asked to dispatch reinforcements to the union. The place Souma sends those troops to is the Kingdom of Lastania. Which is where a former foe, the crown prince Souma once drove from the Principality of Amidonia, Julius, is putting up a hard fight as a visiting general...?! And so, standing shoulder-to-shoulder with Julius, Souma uses his retainers' strength in an operation to save Lastania! The revolutionary administrative fantasy series, volume eight!

A storm is approaching the Star Dragon Mountain Range. Souma ends up confronting a calamity that transcends human knowledge?!

Risking her life to save her homeland, Shabon, a princess from the Nine-Headed Dragon Archipelago, joins Souma's side in hopes of stopping an impending war. But with a fleet already en route to the hostile archipelago under his orders, Souma sets out to infiltrate the islands before they arrive. As he gathers information within the enemy territory, he finds that the real threat isn't their naval fleet, but a massive creature in their waters that defies all common sense...?! What strategy will Souma come up with to handle these two encroaching threats?! Find out in the thirteenth volume of the revolutionary administrative fantasy series!

The Subjugation War Begins! With supplies carried, plans made, and alliances forged, Souma's mission to subdue the rebelling nobility has begun. With a pocket full of tricks, loyal subjects, and modern knowledge, this should be easy! Well... not if you want your civilians to escape unharmed. Or if adventurers keep treading across the battlefield. Or if your nosy neighbors think this might be the best time to launch an invasion of their own. Still, rational thinking will prevail... right?

"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! What's more, he's betrothed to the king's daughter now...?! In order to get the country back on its feet, Souma calls the wise, the talented, and the gifted to his side. Five people gather before the newly crowned Souma. Just what are the many talents and abilities they possess...?! What path will his outlook as a realist take Souma and the people of his country down? A revolutionary transferred-to-another-world administrative fantasy series starts here!