Jiang Niaoniao, a demon maid, can no longer stand being exploited by the young master. She signs up for an undercover mission to infiltrate the Qinglan Sect, hoping only to take it easy and slack off. Little does she know that she has fallen into a trap involving an outrageously expensive contract. Morning classes, sword training, and exams bombard her one after another, while her senior sister keeps a close eye on her every attempt to slack off. If she fails to escape, she must pay one million spirit stones and work for free for a hundred years! It is not until the Demon Clan's young master comes chasing after her to the immortal sect that Jiang Niaoniao discovers the truth: she was never an undercover agent at all, but an exchange student between the Immortal and Demon realms! She turns the tables by signing a contract of her own and making the Demon Clan's young master her personal lackey!