Nise Seijo!? Mira no Boukentan: Tsuihou Saremashita ga Jisuha Saikyou nanode Second Life wo Tanoshimimasu!

When her fiance, the crown prince, finds a new saint, Saint Mira is branded a "fake saint," exiled, and their engagement is broken off. Surprised by this sudden turn of events, Mira asks the swordsman Raul, whom she met at the adventurer's guild, to escort her and begins her journey back to her homeland. During her journey, Mira discovers a previously unknown strength in her own magic. Furthermore, by deepening her bond with the swordsman, she unleashes her extraordinary "saintly powers"!? Meanwhile, troubles arise one after another in the royal capital from which Mira was exiled...

(Source: Kadokawa, translated)