During the Zhenyuan era of the mid-Tang dynasty, Chang'an appears peaceful and prosperous on the surface, but undercurrents churn beneath. The threat of separatist warlords has not faded, court power struggles rage in secret, and the trade routes to the Western Regions bring not only exotic cultures but also bizarre occult arts and unknown evil beings, creating a threefold stage for solving cases: the imperial court, the martial world, and foreign lands.
