The year is 20XX. The Hollow Man Syndrome is a mysterious disease that causes people to become absent-minded as if their souls have been sucked out of them, and it is spreading in a certain region. Mizugaki, an infectious disease control officer, sneaks into a regional city with her subordinate Shinohara to investigate the cause, but they become entangled in strange crimes and mysteries. What is the relationship among the mad scientist's strange disease, the police officer who interferes with the investigation, and the mysterious cult? A mystery thriller that illustrates a large-scale theme about what humans are.