The Kept Man of the Princess Knight

is a Japanese light novel series written by Shirogane Tooru, with illustrations by Saki Mashima. The series began publication on February 10, 2022 by ASCII Media Works under their Dengeki Bunko publishing imprint.

The series won the Gold Prize in the 28th Dengeki Novel Prize.

The series has been licensed for an english release by Yen Press.

Synopsis
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)