Immediately after her engagement to Prince Theodore, Amelie, the Duke's daughter, remembers that she has been reincarnated as a character from a novel she had been reading.

Amelie is destined to lose Theodore to the Saintess, be consumed by the flames of jealousy, and become the "Witch of Ruin" who brings about disaster.

Amelie tries her best to somehow escape this cursed fate, but fate stands in her way again and again.

Finally, driven to a corner, Amelie confesses to Theodore that she is the cursed Witch of Ruin.

It's a bit darker and more intense than usual, but it's fundamentally a happy ending (redemption).