Popolis is a city where for the past few decades, technological advancement has been pushed forward by beverage corporations. R.C. is an arrogant young man who resides in Popolis. After getting himself into some trouble financially, he is desperate to make some cash. Soon he finds himself involved with a secret group know as the C.A.N. Collector Union. This group's purpose is to discretely hunt down mechanical monsters known as C.A.N.s.