--"If something like a next life exists...I want to completely destroy everything you love. I want you to feel the same way I feel right now. You will never be able to escape from my revenge, Gilbert!".

At the age of 20, Orlane Roche, coloquially known as "Bloody Orlane" and "The Dark Saintess of Velza", was betrayed by the man she most loved in the world and accused of high treason, but for some reason, instead of death, she has been given life imprisonment.
Confined to a locked room with only her thoughts, she desperately wondered where had she gone wrong when all she did was for love, and in despair, commited suicide by hanging, but not before vowing to return and enact bloody revenge against the people who wronged her, specially towards one man in particular, the Crown Prince-- now Emperor of Velza, Gilbert--and former lover.

--20 years later,
Cecelia Zadkar, crown princess of one of the northern kingdoms, who is currently living as a political hostage in the Velzan Empire, the greatest superpower in the continent, awakens to her past life memories as Orlane and learns of her tragic fate at the hands of the man she vowed to protect.
It would be the perfect opportunity to enact revenge...

--Except for the fact Cecelia is deeply loyal to her beloved princess Adelheid, the daughter of the man who killed her in a past life.

Caught between conflicting emotions, she quickly decides on a compromise.

---She'll bring down the scum emperor and install the gentle and wise Adelheid as empress, even if it costs her life!