Countess Lydia, who was reincarnated into a romance novel she read in her previous life. To change her fate of being killed by her "villain" fiancé, she decides to seek help from an opposing secret society. A negotiation begins with Duke Liage, the head of the Royalist faction who appeared as the negotiator, but... before she knew it, she was forced into an engagement with him!? A cold strategist wearing the mask of an orthodox hero directs a mysterious obsession toward her——? "Make me enjoy myself, will you?" A dangerous contract love fantasy between a "mob lady who wants to avoid death" and a "mysterious duke who manipulates the country through an underground organization"!