In early 2026, an unknown cosmic-level phenomenon tore apart the fabric of reality, and the earth briefly overlapped with countless parallel universes at the same time.
- At the moment of overlap, the laws of physics from another world invade: gravity is chaotic in some areas, Chicago neighborhoods float in the air; Ginza in Tokyo is permanently polluted by magical radiation; Ice Age ecology appears in the Sahara Desert
- The most deadly thing is the influx of "realm creatures": the dragons on the magic side tear apart the fighter groups, the nanoworm swarms of the silicon-based civilization devour the city, and the Cthulhu-like whispers plunge the entire island into madness.
- In the past ten years, the global population has plummeted from 8 billion to less than 300 million, and civilization has regressed back to the era of city-states and refuges.
