An infamous villainess finds herself transmigrated into the body of a girl named Hailey, who is destined to die in one year. She’s thrown into a cursed valley, but instead of succumbing to her fate, she survives by using Hailey’s latent genius to purify corrupted magic and save people from a zombie curse. Despite her fearsome reputation as the “Demonic Marchioness,” people are drawn to her for protection, leaving her confused as to why they aren’t afraid.