破滅ルートを目指し、完璧な悪役令嬢になってみせますっ!～推しのため当て馬をやり遂げたいのに、無愛想な護衛騎士様がやたらと絡んできます～

"Wait, being a villainess is actually pretty easy!" Sashuna is reincarnated as the villainess in the world of a romance novel she used to read with her grandchild in her previous life. To protect the happy ending of her "bias"—the novel's original heroine—she resolves to play the role of the villainess to the very end! Or so she thought... The problem is, she can't shake her kind "grandma" personality from her past life. Without even realizing it, Sashuna’s reputation keeps skyrocketing! To make matters worse, her fiancé’s escort knight, Josner, finds out her true identity—!?