The scene is Steam City, a London-ish city which represents an entire civilization run by coal and steam power. Because of steam, the city is sometimes covered in a mist. Villains take advantage of the steamy mist to hide and execute their evil plans. Only a few dare venture into what's beyond the steamy mist. They are known as the Steam Detectives: Narutaki (and his convertible all-purpose pistol), his nurse-assistant Lingling, and his Megamaton robot Gohliki.
Mostly episodic, but with recurring villains whos story arcs are fleshed out over the entire series. The plot is serviceable, in that you know everyones motivations, and can follow the events well. Most episodes establish their own setting/characters, the villain makes his move, and Narutaki tries to stop him.
The name suggests it's a detective show, but it's more like a cop drama because Narutaki takes a very hands-on approach to catching the criminals himself while his robot Goriki fights the criminals robots. There is some detective work, but the focus of the show is definitely the confrontations between Narutaki and the criminals
art that lends itself well to the steampunk theme. Heavy use of muted and earthy colours. The animation is of very respectable quality for the 90s, there's never any derp moments.
The soundtrack for this anime is it's high point. Alot of jazzy themes, many of which include vocals. They always very appropriately fit whatever scene they're played in. I had to download the soundtrack so I could listen to it more.
Narutaki and the villains are all unique and very well developed. Everyone else is a bit bland. Especially the characters who only appear for 1 or 2 episodes. They're just introduced to set up the episodes plot.
It's no masterpiece, but it is very engaging. You finish one episode and want to go to the next right away. Although it is somewhat carried by the music.
I highly recommend it if you enjoyed any of the games in Liar Softs steampunk visual novel series as they share a very similar plot structure.