The Kept Man of the Princess Knight, Vol. 1 (manga)

While the beautiful princess Arwin selflessly delves into the dungeon searching for a way to save her kingdom, Matthew aimlessly wastes his days (and her money) on brothels and booze. Causing trouble wherever he goes on the rough streets of the Dungeon City, Matthew is scorned by everyone-except for Arwin. When it comes to her, Matthew's loyalty may run far deeper than his deplorable reputation lets on. Could his attitude be nothing more than a facade to hide the true lengths he would go to for the princess...?