Thousands of years later, humanity has advanced into space. Here it has divided into two countries with two different forms of government: the autocracy of the Galactic Empire, and the democracy of the Free Planets Alliance. These two countries have been at war for 150 years, which turned the galaxy into a stage for a never-ending series of conflicts.
As the long war continues, both countries fall into decline. The Galactic Empire suffers corruption among the noble classes, while the Free Planets Alliance falls victim to the mob rule of democracy. Then, near the end of the 8th age of the space calendar, the appearance of two geniuses will change history forever. The unstoppable genius, Reinhard von Lohengramm, and the unbeatable magician, Yang Wen-li. As heads of the Imperial and Alliance armies respectively, the two will face each other in battle over and over again. (crunchyroll)
In the land of Terra, natural disasters of unknown causes have been occurring irregularly in many areas. Therefore, the majority of the people, in order to escape those natural disasters, came to live in mobile cities developed over the years. The Originium left behind at the site of such Catastrophes, has led to the rapid progress of civilization due to their immense energy. But it also brought something else with it — an incurable disease called Oripathy.
Because the bodies of those with Oripathy gradually crystalize and become a new source of infection at the time of death, in many countries, the Infected are subject to persecution under regimes of segregation and forced labor. Those who were oppressed by the governments are starting to rebel. Rhodes Island, a pharmaceutical company researching a cure for Oripathy, takes up their arms and starts a conquest trying to save all the people from the disease. (arknights-anime.jp)