Steam City's mist isn't just a gimmick, it's permission to hide villains with actual stakes, actual plans that carry across episodes instead of resetting. Narutaki walks into that fog knowing exactly what he's after, and the show trusts you to track the threads without spelling anything out. Nobody remembers this one, which is exactly why it still works.
In the coal-powered metropolis of Steam City, thick mist blankets the streets every day, transforming the urban landscape into a maze of shadows and obscured danger. Criminals exploit the perpetual fog to carry out their schemes without fear of witnesses, leaving the city's authorities helpless. One man refuses to accept this lawlessness: Narutaki, a brilliant detective armed with an experimental all-purpose pistol and partnered with Lingling, a capable nurse whose medical expertise proves invaluable in the field. Together with Gohliki, a towering mechanical guardian, they venture into the suffocating mist where few others dare to tread. Each case pulls them deeper into Steam City's corruption, revealing a web of industrial sabotage, technological experimentation, and sinister conspiracies that threaten the city's foundation. Narutaki's unconventional methods and Lingling's quick thinking balance the raw power of their mechanical ally as they chase down leads through steaming alleyways and abandoned factories. The mist that enables crime also becomes their hunting ground.