悪役令嬢としてヒロインと婚約者をくっつけようと思うのですが、うまくいきません…。

Saionji Shiri is a carefree girl reborn into the role of a villainess from a romance novel she once read halfway in her past life. Thrilled by the chance to see how the story unfolds, she eagerly takes on her mission to unite her fiancé, Hojo Kaname, with the heroine, Suzuhara Sakura. Armed with her knowledge of the plot, Shiri dives into her role with gusto, ready for heartbreak and betrayal—except nothing goes as planned. (Unreviewed summary by Grok 3)