The Kept Man of the Princess Knight Novel Volume 2 was written by Toru Shirogane and illustrated by Saki Mashima.

There's no escaping his dark past…In the wicked city of Gray Neighbor, Matthew continues the dirty work of hunting down street dealers selling Release. He goes to great lengths to wean Arwin off the drug and protect her reputation—even going so far as to permanently silence a friend who discovered the princess knight's secret. And Matthew isn't the only one trying to clean up the Dungeon City. Paladins have arrived to address the rampant corruption, and among them is a knight searching for his sister's murderer. Despite Matthew's carefully crafted image as a weak and harmless kept man, he begins to draw suspicion. Will his dark deeds and Arwin's secret come to light…?