Dirty Pair (ダーティペア, Dāti Pea) is a series of sci-fi comedy light novels written by Haruka Takachiho that was later adapted into anime and manga versions. The franchise has bounced across multiple formats and production companies, resulting in (so far) eight novels and a few shorter stories, a television series, two OVA series', two OVA features, a feature film, a number of graphic novels, and two short Japanese radio series. The series won the Animage Anime Grand Prix prize in 1985.
The stories take place in the years 2138-43, by which time humanity has spread across some few thousand star systems. A corporation called the World Welfare Works Association (also WWWA or 3WA) helps member systems of the United Galactica (UG) federation deal with various planetary-scale problems, for profit, by sending agents called "trouble consultants". Probably the most high-profile arm of the organization is the Criminal Investigations section, which works to solve crimes or mysteries. The series focuses on a team of trouble consultants in that section, named Kei and Yuri, who have a reputation for leaving a trail of destruction behind them, for which they are known publicly as the "Dirty Pair".