It is a world where memories can be turned into data, where the death of the physical body can no longer be called death.
It is possible to save one's memories in a databank, transfer one's memories into a new body, and buy and sell memories. It is also possible to illegally falsify memories and steal memories. Society is plunged into chaos and stagnates.
Then, there is a man who awakes in a destroyed room. His name is Kaiba. He has no memory. There is a picture of a woman he does not know in his pendant. There are electrolytic clouds moving strangely in the sky, and there are memory hunters causing troubles in the streets.
Kaiba, who is suddenly attacked and escapes into space, travels from planet to planet, meets various people, and comes to retrieve his memories - memories of his former self who agonized over the contradictions and banality of this world and his own existence, and of the the woman in the pendant called Neiro...
Here is the translation from the shows webpage.