It is now possible to store memory data, so that the death of your body is not actually "death". As memories are stored in databanks, they can be "transferred" to new bodies. Because so-called "memory trading" now occurs, it is now possible to steal memories and illegally alter them.
Society has fallen apart as authority has become lost and stagnant.
One day, a man awakens in a ruined room. His name is Kaiba. He has no memories, but he does have a pendant with a picture of an unknown woman inside...
In the skies a mysterious cloud of electricity floats, stalking the streets to hunt for memories.
After suddenly being attacked, Kaiba escaped into space, and during his travels meets all sorts of people and regains his memories. Throughout it he continues to be troubled by the world's problems, as well as his own existence. And what of the woman in the pendant, Neiro?