"The moment you touch an old object, you become the next sacrifice."
Lin Yan, a 26-year-old restorer of ancient books, is dragged into a strange space called the "Domain Ruins" by half of a Nuo opera mask left behind by her grandmother. Every domain here is a regional culture swallowed by its era, steeped in the resentment of countless people. Before the countdown at each "Cultural Node" ends, she must solve folk riddles, or she will be assimilated by the domain forever.
