Geologist Dr. Iris Thorne sensed an abnormal "geocentric pulse" emanating from the earth. Soon, the giant existence "Dougev" appeared from the center of the earth and began to systematically "clean up" the severely polluted areas on the earth. Dr. Aires believes that this is not indiscriminate destruction, but some kind of "self-healing" or "liquidation" of the earth, and speculates that humans may be able to communicate with it by repairing the earth.
