When I Was Reborn As A Villainess... A Foreign Spy Proposed To Me!

Story :  When the main character of this story has a tragic accident and loses her life, she chooses to be reborn as a noble woman in the Kingdom of Rubblepyle.
It's a world from one of the many otome games she enjoyed in her previous life.
When she regains consciousness, she is the villainess Amuneris, who has just been banished from the kingdom by her ex-fiance, the prince.
Amuneris tries to use her knowledge of the game to try and get past this predicament, only to find herself in an even worse situation. In fact, she ends up in prison!
Her new life in a different world starts the worst way possible......!? Or so she thought. That's when Belnis Amore, a spy from a rival country, offers her a helping hand!! However, his terms for receiving his help are...!?

What're the motives of the spy for approaching Amuneris, the former fiancee of the prince......? This is the start of a romantic fantasy between people from different social classes, in a game full of conspiracy and political intrigue!