The setting is modern-day Japan.
About 30 years ago, humans with "supernatural abilities" suddenly began to appear.
These abilities are innate, and their types and strengths vary greatly from person to person. Approximately 5% of the total population possesses abilities, ranging from those useful in daily life to those dangerous enough to threaten an entire city.
The existence of supernatural abilities has been accepted by society, but "ability crimes" that exploit these powers are increasing year by year.
While the regular police handle ability crimes, many cases involve evidence erased by abilities or inexplicable phenomena, and it is not uncommon for them to be difficult to solve.
For this reason, the police have established a system to request cooperation from private ability detectives for difficult-to-solve ability cases.
Among them, the "Kurosaki Detective Agency" is known for its exceptionally high resolution rate of ability crimes.