The Kept Man of the Princess Knight, Vol. 2 (manga) — Toru Shirogane

The past catches up to Matthew after a (violent) reunion with his old flame Polly. They recall the life they shared just a year before, the friends and enemies Matthew made while down on his luck, and how everything changed when Matthew first met Arwin. Now Matthew comes face-to-face with the consequences of what happened after that fateful meeting, as sinister forces emerge, threatening him and his allies...All alone without sunlight to save him—has the scoundrel manservant of the princess knight cracked his last joke?