Dream Gold: Knights in the Dark City

Dream Gold: Knights in the Dark City (ドリムゴード〜Knights in the Dark City〜) is a manga series by Tatsurou Nakanishi. It was serialized in Comic Blade.

Plot
In a world where technology and magic fuel the dream for riches, the Knights of the Dark City are sent out to find the hidden treasures that the world craves. Kurorat Jio Clocks, the clever rat of Higurashi Street, will join the Knights in their frantic hunt for wealth, and for the ultimate prize - Dream Gold. All who search for treasure search for Dream Gold, but this quest will yield one winner...