Tensei-saki wa Korosareru Hazu no Mob Reijou deshita: Mishiranu Koujaku-sama to no Konyaku wa Souteigai desu @COMIC

“Can you entertain me?" Lydia, the countess who was reincarnated in the romance novel she read in her previous life. In order to change the fate of being killed by her "villain" fiancé, she decides to ask for help from a hostile secret society. The game begins with the leading royalist duke Liage, who appeared as a negotiator, but... When I realized, I was engaged to him!? A ruthless strategist who wears the face of an orthodox hero is obsessed with a mystery ──? Mob young lady who wants to avoid death × The mysterious duke who controls the country in the behind-the-scenes organization dangerous contract love fantasy! (Source: TO Books, translated)