Although it is often said that these are younger versions of the original Lovely Angels Kei and Yuri, in truth this series is an alternate universe telling of Dirty Pair.

Compared to the wealthy and affluent world of the original Dirty Pair, Flash takes place in a universal human civilization where mankind is recovering from a major galactic economic crash which then spurred an intense decade of wars and conflicts before the setting's current era of stable if rather uneasy peace.

In a somewhat more down to earth if cynical backdrop, mankind continues on its leaps and bounds of technological and scientific progress despite economic struggles and recoveries throughout the galaxy.

Unlike the original pair, the two suffer from both the struggles of everyday working life and their own human faults; Kei is hotheaded and headstrong, Yuri is capricious and passive, and both share many things in common than they would like to admit: both come from backwater colonies and outpost worlds, both only have their jobs presumably as merely a headway in their yearning for something more in life, and both barely passed 3WA's academic and training screenings, despite holding one of 3WA's most renowned positions as 3WA's historically famous namesake Trouble Consultants.

In addition to the sixteen anime episodes, there have been three novels (1994, 1997, 1999) and four "Stereo Dramas" (one in 1994, the others in 1996) written by Takachiho, as well as two sanctioned manga series (1995–96) published by Dengeki Comics.