The Too-Perfect Saint: Tossed Aside by My Fiancé and Sold to Another Kingdom novel volume 3 was written by Fuyutsuki Koki with illustrations by Masami.

Philia's hope of wedded bliss is interrupted by the news that the pope, sacred leader of her faith, has passed—and that his will names her as his successor?! Together with her fiancé Prince Osvalt, she heads to the neighboring nation of Dalbert, seat of the papacy, to investigate how this came to be. There, the duo finds proof of a conspiracy that tampered with the pope's will! Can they get to the bottom of this? Or is Philia's newfound happiness in Parnacorta doomed to be short-lived?