Beyond the real world lies an abnormal space called the "Zero Realm," formed from human memories, choices, and unfinished obsessions.
It selects certain people through black cards and takes them into strange "Domains" that defy the laws of reality. Candidates must observe their surroundings, understand the rules, and complete their tasks using the limited abilities of their cards.
Those who fail may die, lose their memories, or be left behind in a Domain, becoming characters in the next round of the game.
At its core, the story isn't simply about fighting monsters. It's about this:
When information is incomplete and the rules may be misleading, deciding what is worth believing.
