Unified calendar 1926. The Air Magic Battalion 203 of the Imperial Army, led by Major Tanya von Tegurechav, launched a campaign against the disabled Party of the Army of the Republic in the southern mainland. They are looking forward to a triumphant holiday, but what awaits them at home is the special orders of the staff headquarters. The order said there were "signs of large-scale mobilization near the federal border". Faced with the awakening of the new giant, the desperate Imperial Army naturally expanded its achievements. At the same time, the United Kingdom-led multinational volunteers stepped into the Union. The enemy of an enemy is a friend. Guided by the reason of the country, there is a young girl among them who welcome their ill-fated fate. Chief Mary Sue. She picked up a gun in order to get justice from the empire that killed her father.