One day, inexplicable supernatural phenomena suddenly begin appearing all over the world. Some people hear someone calling their name outside their door at midnight. Others board a bus that never reaches its destination. Still others enter an ordinary-looking convenience store, only to discover that the products on its shelves move around on their own. More and more buildings, roads, and entire urban areas are transforming into supernatural domains. Anyone who enters one must follow the hidden rules concealed within these anomalies. Once they violate a true taboo, they risk being devoured by the supernatural entities or even becoming part of the domain itself.