A person reincarnates in her friend's novel one day. But she doesn't deviate from the plot; she absolutely plays her role to a T and beholds the novel's events irl. However, despite absolutely sticking to the plot, halfway through the story, the plot completely changes! "Why is the Villainess in love with a side character!?" While the reincarnator doesn't understand why this is happening, this story closely follows the Villainess straying off her original path