I'm the Heroic Knight of an Intergalactic Empire! (Manga) Vol. 2

Rookie knight Emma has been branded incompetent and shipped off to the frontier. But none of her superiors realised that pirates are hiding out in these remote areas. She handled the first wave, but now an enemy aircraft is approaching, and the only person answering Emma's call for reinforcements is her old instructor, Claudia. This is the very same instructor who failed Emma turning training. Will this battle be the chance she needs to prove herself to her old mentor?