In the blood moon of 2026, "regular anomalies" appear one after another on the edge of the city: the elevator will disappear if the wrong number of people is there, the fog wall at the bottom of the river will swallow up people who turn back, and the unmanned bugle will sound around the ancient city gate. Retired scout Li Wang awakened from a "ghost mark" in a ghost gate at the bottom of a river. He could see the boundaries of the rules, but at the cost of amplified pain and memory gaps, he was specially recruited into the anomaly processing system "Youdu Division". He, the rules officer Lin Xuanzhen, and the successor Bai Tang formed a night-walking trio: one person checked the conditions, one person used argot to borrow a path, and one person used tactics to counterattack in the three-second window. As the broken jade horns and ancient jade rubbings surfaced, clues to the missing comrades also pointed to the same door - the entrance to Youdu. The closer the blood moon is, the harsher the rules become; every time they break a game, they are one step closer to the truth and one step closer to the price.
