One day, a quiet town suddenly gets enveloped in mysterious smoke. There were spurts of steam gushing out from various places, completely covering the entire town in deep disguise. Only coals were being found in this quiet town until now, but something eerie is being discovered. What is it? Within the deep, white smoke arise numerous monsters and phantoms bringing misery and disaster to the people in town. This town is no longer a peaceful place on earth. We call this city "Steam City." A teenage detective (Narutaki) together with a nurse (Ling Ling), a powerful fighter (Goriki), Steward Kawakubo and other detectives fight against the crimes and villains in order to save the town. <br />