Saeba Ryou works as a sweeper — he sweeps crime off the streets. His partner, the tomboyish Makimura Kaori, deals primarily with the business side of things, and has a crush on Ryou, though she is reluctant to admit it. The clandestine City Hunter team is available for hire for missions like protection and private investigation, and Ryou has made it his policy to primarily take on jobs involving beautiful women. They can contact the team by writing the letters XYZ on a blackboard at the Shinjuku station.

Source: Wikipedia

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Same setting: Cat's Eye
Sequel: City Hunter 2
Other: City Hunter: Ryou no Propose
Alternative setting: Gekijouban City Hunter: Shinjuku Private Eyes
Other: Gekijouban City Hunter: Angel Dust