Steam City is a metropolis continually enshrouded in a veil of mist. With the steam obscuring vision, the police frequently have trouble with opportunistic criminals who use the limited visibility to commit countless crimes. Many years ago a man known as the Phantom Knight murdered a detective and his wife only sparing the life of their young son. Now, Narutaki is older and runs a detective agency. One night while out on a case, Narutaki encounters the Phantom Knight who has returned to Steam City in order to kill the young orphan. However, instead of killing him immediately he informs the sleuth of his plan: he will bring terror upon the city and turn it into a living nightmare. Now Narutaki alongside his new sidekicks, Ling Ling and her steam-powered robot Goriki, must protect his hometown and prevent the Phantom’s attacks.
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