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

Matthew has a seemingly endless list of troubles. Arwin symptoms and recovery are worrying, and her party isn't making much progress in the dungeon. The Sun God's influence is spreading surreptitiously. And Imperial Guard knights have been dispatched from the royal capital to maintain public order in the Dungeon City. Their presence sends shock waves through Gray Neighbor, disrupting the normal flow of things in the vice-filled city. To top it all off, one of the knights in the Imperial Guard has come to investigate the death of a guild appraiser—his own little sister. What will become of Arwin when Matthew becomes a suspect and they are separated? The lifeline between the two strains, perhaps to a breaking point…