Outside the real world, there is a mysterious "reincarnation space". This space brings together people from different times and backgrounds, and the participants are called "reincarnators." They are forced to get involved in one terrifying reincarnation mission after another. The reincarnators can only obtain rewards and survive by completing tasks. If they fail the task, they will die. The reincarnation space has unique rules and mysterious origins, and there seems to be a huge conspiracy hidden behind it.