Yui Shirosaki knows every plot, betrayal, and failed scheme from the first five volumes of her favorite light novel, The Villainess Who Destroys the World. Unfortunately, she dies before she can read Volume Six. When Yui awakens in the lavish bedroom of a medieval castle, she discovers that she has been reincarnated in the Kagetsu Kingdom, the setting of the novels she knew by heart. But something is wrong. Yui Shirosaki never appeared in any of the books. She is not the heroine, the villainess, or even a minor character destined to influence the plot. She’s not canon. She’s filler. And she knows it.