Saijaku Muhai no Bahamut

The story takes us into the daily life of Lux, a former Machiavellian prince of a tyrannical Empire that has now disappeared. He was also a formidable Drag-Knight. (A knight using a powerful ancient weapon) Today, he works as a handyman in the new kingdom of Atismata to atone for his mistakes. However, a strange incident leads him to join the Royal Officer Academy, which trains young girls to pilot the powerful Drag-Rides (giant combat armors). Thanks to his skills, Lux joins the iconic Knight Squadron, whose objective is to protect the city.