Cassmire: The Loyal Sword

Here's an improved English synopsis, incorporating your specific requests: "Cassmire Crisis has lived a hard life, working as a mercenary to afford medicine for her beloved younger half-sister, Aria. One day, a fall triggers the sudden return of her past-life memories: she was once a reader who is now reborn into the world of the novel, "The Night of the Fairy." To her horror, she realizes Aria is the destined heroine of a reverse-harem romance, while she, Cassmire, is fated to be a villain who makes Aria's life miserable! Determined to rewrite the narrative, Cassmire vows to protect Aria from any harm until her adoption into the count's family, following the original storyline. However, things quickly deviate from the plot. The male leads, who should be vying for Aria's affection, unexpectedly become fixated on Cassmire instead! All she wants is to safeguard her precious sister, but fate seems to have other plans. Can Cassmire navigate this twisted world and ensure Aria's happiness? To save her younger sister Aria from a debilitating illness, Cassmire picked up a sword and embraced a life of blood and steel. Now, burdened with the knowledge of her past life, Cassmire must once again become her sister’s loyal sword, shielding her from the predetermined hardships of the novel. Read Cassmire: The Loyal Sword on capitulos.cloud completely free and without intrusive ads." Read the MANHWA (Cassmire: A Espada Leal, Cassmire: La Espada Leal, Cassmire: The Faithful Blade, 캐스미어: 충성스러운 검, キャスミア：忠実なる剣, 卡斯米尔：忠诚之剑) online at Capitulos.Cloud completely free and without ads, with the latest chapters updated.