A new nation, the Kingdom of Friedonia, is born and Souma becomes its new king. He broadcasts an educational program and is gradually working towards the enlightenment of his people when he makes a visit to Lagoon City, a city on the water which is ruled by Excel who has been appointed the Supreme Commander of the National Defense Force. There he finds Castor, the former General of the Air Force who Souma once defeated, waiting for him. When Castor becomes suspicious about his sudden visit, Souma reveals the National Defense Force's top secret project?! "You... What in the world have you created...?" When Castor is struck dumb by the unimaginable sight he witnesses, what will the order Souma gives him be?! The story moves on to the next stage! The fifth volume of the revolutionary transferred-to-another-world administrative fantasy!

The Gran Chaos Empire is the largest nation on the continent and the leader of the Mankind Declaration, a united front against the demons. Amidonia uses part of the text of that declaration which states, "The moving of national borders by force will be deemed inadmissible," as their shield, borrowing the might of the Empire to demand the return of their capital, Van, but Souma refuses. And so, negotiations begin with the Empire's envoy, Jeanne, the younger sister of the Empress. "We do want to enter an alliance with the Empire. A secret one." With the tempest of war behind them, the goals of the different nations send sparks flying in the seventh volume of this transferred-to-another-world administrative fantasy series!

"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!

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!

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!

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!