2061 AD. Fifty years have passed since mankind developed the Network society. A new Network realm with more effective security measures was developed. This was called Meta Real Network, usually abbreviated as "the Metal." The Metal accommodated personal memory data within protected virtual stand-alone organic cyber enclaves called bubble shells and eventually pervaded the everyday lives of people.

Strange friction between "the Metal" and the real world began to manifest themselves as aberrations beyond the bounds of the imaginable. Experts who challenged the deep sea of the Metal to investigate and decipher such aberrations were called cyber divers.
This is a story of a cyber diver, Masamichi Haru, who investigates the incidents that lie between Reality and the Metal.