What kind of title is this?: Light Novel.
Where can I read it?: Reading links are listed for Official Site, Yen Press. Check availability in your region.

Synopsis

About The Kept Man of the Princess Knight

Matthew is just another parasite in the chaotic dungeon city of Gray Neighbor. People say he's a lazy weakling who gambles and drinks away all the money he gets from his keeper, princess knight Arwin. But the truth is, no one in this town knows what he's really like—a ruthless protector who works in the shadows and will do whatever it takes for the sake of his mistress. (Source: Yen Press) Note: Winner of the Grand Prize in the 28th Dengeki Shousetsu Taishou.

Action Adventure Comedy Fantasy Romance