For countless centuries, rumors have persisted about mysterious group deaths—instances where clusters of people perish without any known cause. These occurrences are not confined to just the past but reach into the future, and not just within our world but in others we've yet to discover. Some speculate these groups are reincarnated into different realities, transported into fantasies as part of some unknown cycle. But what lies behind these unexplained events? And if those who died were truly reborn elsewhere, is this new existence a gift—or something far more sinister?