It's the year 2057. Boarder lines have disappeared between countries through trade wars. It is not a war between countries, but a war between major enterprises. An enterprise had the power to alter the decisions of a country. Such strange phenomenon has made the trade wars bitter. The fittest enterprises got together to come up with a new system that would cut off the rising forces of other enterprise.
They come up with a new alternative: An alternative trade system that will become a barrier to all future entries: A method to cut down the logistics costs to unimaginable amount; a transportation system that will cut across the Pacific Ocean; and an establishment of a gigantic city with mass production in mind. But, the historical project holds a major flaw.
For the project to succeed, it had to overcome the natural disasters of the Pacific Ocean. Although major scientists and architects opposed, enterprises pushed the project forward. The project, days away from completion, is met with great catastrophe. The natural disasters of the Pacific Ocean results in lost lives. The lives of scientists and workers are lost. More devastating was the fact that although lives were detected, no measure could be used to reach them and save them.
Major material and man power loss resulted as such and some giant companies file bankruptcy. Through this disaster, the prices of necessities and industrial products start to soar. The world is swirled in an era of inflation.
Meanwhile, Korea and Japan joint ventured in developing 'cell robots' that can make decisions by analyzing the variables sensed in its environment. These scientists have acquired the permission from International Human Rights Association to use these robots. These robots become the first independent decision making clone beings.
Furthermore, the newly built city is programmed to be run by these robots. A community populated solely by robots is built: the Mono-Community. But, there are forces that are against the great project. They are on the move to destroy the city.
They call themselves the "Bleeding Fists." To fight against these forces, it was inevitable to produce powerful police robots: the Gunchest series. A total of 45 Gunchests were produced, but, only one remains.

The last Gunchest, Gunchest Vol. 45 fights against the evil forces.