The story takes place in 2035 in the Pacific island city-Xuejianze. After the "Eternal Night" incident four years ago, the communication with the outside world was completely cut off. Mysterious incidents occur frequently...

The social order collapsed and rebuilt, and a new city governing body called Navi was established.

Jian Shenxiu, as the leader of the organization specially established by Navi to deal with mysterious events, leads the search bureau to investigate and solve various strange events in the city. They unraveled the veil of the major forces of Xuejian Ze step by step, wandering, confronting and balancing among them.

In the investigation of each case, Jian Shenxiu gradually got a glimpse of the law behind these mysterious events, and the "truth of all events" gradually surfaced...

Thick fog hangs over the airport, international flights are delayed, and an ace agent from the Space Survey Agency navigates a polar vortex. Enduring severe turbulence, his passport expires, and his luggage is lost, he finds his own body on the baggage carousel, clutching the pendant of his ex-girlfriend, whom he had just met thousands of miles away in New York City. On the tarmac, at the airport control tower, in the cockpit, in the first-class cabin, even on communications satellites... Mysteries unfold in every corner of the sky and on the ground. Who is behind this? Under the vast sky, when will the mystery lift?

The power of a higher civilization begins to erode the entire world. Our world order begins to crumble, disintegrate, and turn to ash. A system called the Old Games sweeps the globe; from now on, to survive, we can only do the following: 1. Strive to survive in every Old Games. 2. Don't move or look where you shouldn't, and complete each game's main quest. 3. "Stay sane!" does not include: 1. Tricking an NPC and making them copy the Ghoul Codex 100 times as punishment. 2. Using the skill [Slide] against the Deep One. 3. Sacrificing an NPC... Mist spreads across the desolate and barren plains, and believers and non-believers will eventually set foot on this land. 'It' is there, and everything seems almost insignificant to 'It'. Even death itself has no such meaning. Where will the world go? ... Cthulhu, Investigators, Role-Playing Groups, Global Game System