The Great Tiger Kingdom of Haan has defeated the Gran Chaos Empire and grown to become the most powerful of all mankind's nations—splitting the world in two between themselves and the Maritime Alliance, headed by the Kingdom of Friedonia. Souma receives a request from King Fuuga of the Great Tiger Kingdom to join him in the “complete liberation of the Demon Lord's Domain.” As risky as this endeavor is, Souma recognizes the need to liberate the demon front and accepts Fuuga’s offer. He gathers information on the mysterious demons in earnest, but when their forces go on the march, the demons seem to possess power beyond anything Souma imagined! Here comes volume seventeen of the revolutionary administrative fantasy series!

The war rages on as Souma takes on the rebellious three generals - but is everything as it seems? As the conflict expands, it's up to the crew to find a way to win without falling prey to manipulation upon scheme behind the scene. Can Souma survive? And with his reputation intact?

With the talks to relinquish Van concluded, Souma returns to the Kingdom to meet face-to-face with the primary culprit of the rebellion, Georg Carmine. When Souma presses Georg about reasons for committing such a crime, the man remains silent. Refusing to talk, and no recourse left, the once famed general is offered “poisoned wine” as a means of atonement... Following this, Castor Vargas, the remaining culprit in the rebellion, is put to trial. “What do you think is the appropriate judgment for fools who raised the flag of rebellion against me?” Souma’s treacherous allies promptly call for the death penalty. However, in order to protect what he must, Souma makes a decision that calls into question his determination as king.

"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!

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!

Treachery upon Intrigue upon Deceit! The war between Elfrieden and Amidonia continues, with Souma and Co. being held off outside the enemy capital. With personal loyalties and strategies being put to the test, is victory really within sight?

Souma, who has come to the Union of Eastern Nations to deal with the demon wave, pushes east toward the intense fighting in the Duchy of Chima. Duke Chima has been gathering reinforcements with a promise to reward those who distinguish themselves in battle by presenting them with one of his six capable children, but the battle has reached a stalemate. En route to the Duchy of Chima, Souma meets the king of the nomadic state of Malmkhitan. As they travel together, Souma learns Fuuga is also there to support the Duchy of Chima. But for Fuuga, who is aiming to be the top contributor to the war effort, Souma is an enemy competing with him for one of the six brothers and sisters. When faced with Fuuga's shocking power, how will Souma handle it?! The revolutionary administrative fantasy series, volume nine!

 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!

After the war with the Principality of Amidonia comes to a close, provisional king Souma receives an unexpected message. It's a request for annexation from his former enemies in the Principality. Facing a civil war and an invasion by other countries, the Principality now needs the Elfrieden Kingdom's strength in order to fight back. Souma agrees to the annexation and summons those who play an important role in the defense of the Principality to Van for an awards ceremony, but the Princess of the Principality, Roroa, is hiding in with the mountain of gifts they give him?! "Souma... Do ya want me? Or don't ya?" When he receives a sudden marriage proposal from Roroa, what will Souma decide to do?! This is the fourth volume of the increasingly popular transferred-to-another-world administrative fantasy!

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!