I'll Polish the Gloomy Count into a National TreasureNew陰キャ伯爵を国宝級に磨いてみせましょう; Inkya Hakushaku wo Kokuhoukyuu ni Migaite Misemashou; Inkya Hakushaku o Kokuhoukyuu ni Migaite Misemashou

A popular web novelist dies right as she's plotting her series finale, waking up reincarnated as Elysia, the mob elder sister of her own story's heroine. In the original plot, a handsome yet introverted, socially awkward Count was supposed to end up with the heroine, Miria. But shallow Miria rejects him, calling him too plain and dull, and shoves him onto Elysia instead. Determined to steer the story back onto its proper track, Elysia whips out her original plot notes to give the Count an elite makeover. The twist? Once polished, the gloomy Count turns out to be an impossibly breathtaking, diamond-in-the-rough beauty, far exceeding anything she designed! As Elysia finds herself falling for her own creation and her sister harbors sinister motives, the story veers completely off script.