Black fog is gradually appearing in this world, and the urban citizens shrouded in the black fog will end their own lives. However, the city of the protagonist group has not yet appeared, and the upper-level leaders have not discovered it yet.
Three of the protagonists all experienced the death of important people, were spotted by [■■], became one of the few capable people, and were discovered by the world's mysterious organization. There was also a person with a special identity who gave them an important mission.
Purpose: Protect the people from the black mist and obtain their rewards at the same time