統一歷1926年。譚雅·馮·提古雷查夫少校所率領的帝國軍第二〇三航空魔導大隊，在南方大陸發起攻打共和國軍殘黨的戰役。他們期待著凱旋休假，但在本國等待著他們的卻是參謀本部的特命。命令稱“聯邦國境附近有大規模動員的徵兆”。面臨新的巨人的覺醒，不顧一切的帝國軍自然地將戰果擴大……與此同時，聯合王國主導的多國籍義勇軍踏入了聯邦內部。敵人的敵人即是朋友。被國家理性所引導，迎來多舛命運的他們之中，有一位少女。瑪麗·蘇準尉。她為了向殺害父親的帝國討回正義，而拿起了槍。
Unified calendar 1926.
The 203rd Aviation Magic Brigade of the Imperial Army led by Major Tanya von Tigurechaf,Initiated a campaign against the remnants of the Republican Army in the southern continent. They are looking forward to a triumphant vacation, but what awaits them in their home country is the special mandate of the staff headquarters.he order stated that “there are signs of mass mobilization near the federal borders”.
Facing the awakening of the new giant, the desperate Imperial Army naturally expanded the results…t the same time, a multinational volunteer army led by the United Kingdom entered the Union.
The enemy of the enemy is a friend.
Guided by the rationality of the country, one of them is a young girl who has ushered in a miserable fate.
Warrant Officer Mary Su.
She took up a gun to get justice from the empire that killed her father.

source