The Do-Over Damsel Conquers the Dragon Emperor, Vol. 4 (manga)

Time has turned back six years, and Jill, the daughter of a noble, is doing her life over. Jill heads to the Ravean Empire-s capital with Hadis and the others, but on the way, they are attacked by the imperial army that revolted against the emperor! In order to investigate why they were driven out of the capital and protect Hadis from harm, Jill disguises herself and takes the exam to join the imperial Dragon Knights!