Reborn, I Forced a Happy Ending with the Villain

After being reborn, the plot of a book suddenly appeared in her mind. She never expected that she was merely a cannon-fodder character in the story... A scheming, obsessive female academic prodigy X a cold-on-the-outside, warm-on-the-inside gentle otaku A fantastical, sweet little romance. I am terrible at writing introductions, so please read the book. (P.S. It is wildly imaginative and rambles all over the place. If that is not to your taste, please do not enter.)