Sheng Chuyang transmigrates into a book and becomes bound to a demon-hunting system, turning her into the greatest nemesis of the demon clan. As long as she completes her KPIs, she can return to the modern world with all her accumulated assets. With only one ninth-rank great demon left to capture, she falls in love at first sight with Fu Mingxi, a nine-tailed fox, and becomes preoccupied with touching his tails and winning over her husband. Little does she know that he is actually her final KPI, while she herself is the demon clan's nemesis whom he has schemed to eliminate! She has no idea that he is the last ninth-rank great demon she must capture, and he has no idea that she is the demon-hunting nemesis he intends to destroy. Unaware of each other's true identities, they fall deeper and deeper in love. Only in the end does she discover that she has actually flirted her final KPI into becoming her husband!