For reasons unknown, reports of abnormal creatures appearing around the world and cases of people awakening supernatural abilities have continued to rise. In response, after the Great Incident, special departments tasked with eliminating abnormal creatures and resolving abnormal events were established in countries around the world. Their primary purpose is to deal with the growing number of cases that defy common sense.
"Our motto is: Discover, investigate, resolve."
On New Year's Day, 2018, a young woman from China using the alias Xiang Yue set foot in Japan and began a three-year course of study.
