The Villain's Cannon Fodder Bride

[WARNING: MATURE CONTENT]
Reborn into the world of her favorite novel, 'Auberon's Edge', as the maid of an unimportant side character - the doomed princess who would be married off to the villain and then killed in a fit of anger some time after they were married - Rache is faced with a moral dilemma: does she use her knowledge to flee the to-be-conquered nation and live somewhere she knows will be safe, or risk upturning the fate of the book by warning Princess Airie about her impending doom?

Before Rache can decide, she's ambushed in her bedroom by the princess' guard. Knowing how dangerous the black hearted prince of Sidera is, the princess declares she's forcing her maid to go in her place due to the maid bearing a striking resemblance to her own rare features, while the real princess goes into hiding until her parents can find a way to get untangled from Sidera's web.

"Remember, if the prince finds out the truth, he'll kill you first."

Trapped in a marriage to a cold-hearted sadist who only loves violence, railroaded into a pointless ending before the story even begins. There is no escape to this twisted romance but death.

Rache - the new Princess Airie - will not go so quietly into the night.

"Let's break up!"