Devoted Knight Kuon, a corruption hentai game developed by circle Tsukudaninosato. Released November 3, 2016. Download on DLsite.com for $15.00. For PC Windows. No voice acting.
After her princess is kidnapped and imprisoned, devoted knight Kuon must strengthen her powers and storm the castle! Will she be able to save Princess Dia?
Devoted Knight Kuon has been a close friend of Princess Dia since childhood. Six months ago, the king of this nation died, leaving Dia as heir to the throne. Everything seemed perfect until a scheming minister tried to usurp the throne!
Source: N4G PC [NSFW] Hentai Game Review: Devoted Knight Kuon's Records of Lewdness