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.
(Source: ANN)+ More
Characters & Voice Actors

Hsu, Ling Ling
Main
Taguchi, Hiroko
Japanese
Narutaki
Main
Hoshi, Soichiro
Japanese
Crimson Scorpion
Supporting
Yokoyama, Chisa
Japanese
Dr. Guilty
Supporting
Nishimura, Tomomichi
Japanese
Hsu, Lang Lang
Supporting
Nagasawa, Miki
Japanese
Le Bled
Supporting
Kusao, Takeshi
JapaneseRecommended for you
Nanbaka
TV
23m
Another: The Other
OVA
24m
Battle Through the Heavens
ONA
20m
Initial D Extra Stage
OVA
27m
Wan Jie Xian Zong
ONA
7m
Wan Jie Xian Zong 2nd Season
ONA
7m
Rin: Daughters of Mnemosyne
TV
45m
Peace Maker Kurogane
TV
24m
Twin Star Exorcists
TV
24m
Tales of Zestiria the X
TV
23m
Top Secret: The Revelation
TV
22m
Full-Time Magister
ONA
18m
Corpse Princess: Kuro
TV
24m
Strike Witches 2
TV
24m
Tenchi Muyo! Ryo-Ohki 3rd Season
OVA
30m