Gyakkou Shita Akuyaku Reijou wa, Naze ka Maryoku o Ushinattanode Shinsou no Reijou ni Narimasu

Once hailed for her extraordinary magical power, she was chosen to become the crown prince's fiancée — a future that glittered with promise. Then a saintess appeared, and everything changed. Gripped by the terror of losing everything she had, she made desperate, reckless choices, and soon found herself accused of unspeakable acts against the saintess herself. Her engagement was annulled, and she was banished to a monastery. She never completed the journey: bandits ambushed her along the road, and her life ended there. Yet death was not the end. When she opened her eyes, she had been flung three years into the past — back before her downfall began. But this second chance came at a price: her body was now frail, and her once-mighty magic had all but drained away. Resolved not to repeat her mistakes, she chooses a different path this time, determined to seek her own happiness even if it means severing the engagement with her own hands. There is only one complication: the crown prince refuses to let her go. And as if that were not enough, a mysterious dark spirit — one never before seen in this world — appears and chooses her as its master.