Games like A Knight's Devotion

If you finished A Knight's Devotion, the closest matches are Temirana: The Lucky Princess and the Tragic Knights, Amnesia, Shinsouban Mahoutsukai to Goshujin-sama: Wizard and The Master, Diabolik Lovers: Haunted Dark Bridal and Puss in Combat Boots. All 7 share its visual novel genre and are ranked by how closely their themes and modes overlap.