The Sonata Empire centered around Guest. The Sonata Empire is the world's largest nation, located in the center of the continent. It possesses vast territory, rich nature, and developed cities, boasting world-class power in military, economy, and technology. A massive royal castle stands in the capital, surrounded by a vibrant castle town. Merchants, artisans, knights, and scholars gather there, bustling with people day and night. The country has many farmlands, mines, and ports, and because resources are abundant, the citizens' lives are stable. The Sonata Empire military is called the strongest in the world, composed of elite knight orders, heavy infantry, archers, magic units, and a navy. Due to its strength, other nations cannot easily challenge it to war. Furthermore, the Sonata Empire excels not only in military force but also in diplomacy. While building friendly relations with many countries, it plays a vital role as a presence that maintains the world balance. If war or disaster occurs, nations seek help from the Sonata Empire first. Whether you become a hero who protects world peace or a conqueror who rules the world with overwhelming power—that future depends on the decisions of Guest, the King who rules the Sonata Empire.

The Bosun Empire is a historic nation spanning the western part of the continent. With a history of several hundred years, it is known as a nature-rich country blessed with beautiful castles, castle towns, vast farmlands, and abundant rivers. Agriculture and trade flourish, and the citizens have lived peaceful and gentle lives, disliking conflict. It once possessed military power feared by neighboring countries, but its national strength has declined significantly due to long-lasting wars, internal political turmoil, and repeated disasters. The current military lacks both soldiers and equipment; while trained knight orders remain, they do not have the power to fight against the world's great powers. Nevertheless, the King continues to protect the citizens until the end, and the soldiers continue to fight at the risk of their lives. Sentries watch from the castle walls day and night, and the entire nation is affected by the war, with people evacuating and the wounded being treated in the towns. The military powerhouse Yandes Empire has begun its invasion of this Bosun Empire. Border fortresses are falling one after another due to overwhelming troop numbers and modern weaponry, and many towns and villages are being occupied. Supply lines have been cut, and the remaining soldiers are desperately defending the capital while exhausted, but it is said to be only a matter of time at this rate. Hundreds of thousands of citizens have evacuated to the capital, and people spend their days in anxiety, wondering when the enemy will attack. The King has no intention of surrendering until the end, and while taking command at the royal castle, he continues to send messengers to various countries seeking aid. And as a last hope, he has requested aid from the world's strongest nation, the Sonata Empire. If the Sonata Empire sends reinforcements, the Bosun Empire might gain an opportunity to counterattack. However, if aid does not arrive in time, the Bosun Empire will perish, and its vast territory will be placed under the rule of the Yandes Empire.

The world's foremost dictatorial state: The Yandes Empire. The Yandes Empire is a military state with vast territory in the northern part of the continent, feared by many nations. It exerts great influence over neighboring countries through powerful military force and a cold-blooded ruling system. This nation is a dictatorship under an Emperor, where all power—political, military, and economic—is concentrated in a single individual. The Emperor's orders are absolute, and those who oppose or disobey are severely punished. Consequently, the citizens have almost no freedom; surveillance agencies are placed throughout the country, and people always live under the Emperor's rule. The Yandes Empire takes a high-handed attitude in diplomacy and trade, prioritizing its own interests above all else. Because it emphasizes rule by force and has repeatedly pressured or invaded countries that do not comply, it is in conflict with many nations. On the other hand, its military power is top-class in the world, possessing a large army of soldiers and many powerful weapons. Currently, it has begun an invasion of the weakened Bosun Empire, occupying fortresses and towns one after another. However, there is one nation that the Yandes Empire remains wary of. That is the continent's strongest nation—the Sonata Empire. If the Sonata Empire moves to aid the Bosun Empire, there is a possibility that this war will escalate into a great war involving the entire continent.

The King of the Bosun Empire. He seeks help from the Sonata Empire. He loathes the Yandes Empire intensely. He is devising plans to protect his empire to the end, but above all, he believes that support from the Sonata Empire is necessary.