This is book number 3 in the Star Wars Lost Stars (manga) series.
Thane Kyrell and Ciena Ree grew up together on the Outer Rim planet of Jelucan, finding common ground in the joy of flying despite their different social classes. After a chance encounter with Grand Moff Tarkin, they decide to join the Empire, with both graduating at the top of their class from the Imperial Academy on Coruscant. But as they rise through the ranks, they’re exposed more and more to the questionable methods of the Empire. Thane becomes disillusioned, yet Ciena is compelled to stay by her personal code, believing she can change the Empire from the inside. Can their bond survive the Galactic Civil War, even when they’re forced to be enemies? Lost Stars is an action-packed love story, set against the backdrop of the events of the original Star Wars trilogy — making it a great entry point for anyone looking to dip their toes into the expanded universe. Claudia Gray has crafted an excellent tale worthy of the Star Wars canon, with likeable, morally-gray protagonists, thrilling space battles, and an ending that will leaving you wanting more.— Darcy