Ryo Saeba is a "sweeper" know as the City Hunter. He and his sidekick Kaori Makimura are hired to solve problems that the police can't (or won't) handle. When he's not keeping the streets of Tokyo clean, Ryo is chasing the ladies, and Kaori chases after him with a giant anti-ecchi hammer.
The direction City Hunter's production took was a big one in this season, as they have changed the whole feel of the show. Mostly in the art but the music is not that 80's pop feel anymore. The anime's format is as always 1/2 episode stories about clients who have come to Ryo and Kaori for help. Even though this big change happened to the city hunter franchise you won't be disappointed (completely) and it all corrects itself in the fourth season so just endure it for 13 episode.