Petra received word from her grandfather that Brigid is having trouble sending soldiers to Fodlan due to the Empire's meddling. She asked the professor and Bernadetta to come along with her to stop them... by asking Bernadetta I mean dragging her along to lend a hand... at least, according to the professor.
The mission is the same as the Crimson Flower version with a few minor differences, one being Hubert being the boss instead of Catherine, and I actually let Petra free her allies since I forgot to do that when I did the Crimson Flower version.
