Once every seven days. Those chosen will vanish from reality. Some wake up in a late-night hospital, some are trapped in a sealed school, and others enter long-abandoned subways, closed malls, or empty hotels. No one knows where the "Dungeons" come from. People only know: Most of those who enter never come back. And you, are among the few who can see the "mortality rate." Opening a door, speaking, staying put, trusting someone... the numbers in your eyes keep surfacing, cold and clear. [Mortality Rate: 87%] [Mortality Rate: 12%] [Mortality Rate: 99%] Just that. The numbers can tell you the danger. But they will never tell you— Where the danger actually comes from.