Lexis : The Great Ecariya

Humans, who are infamous for having hostility among themselves, made several dangerous bio weapons and humanoid fabric and robos to use them to kill each other but it turns opposite when their made weapons were the results of their own destruction...
Now after the brutal genocide of humans by their own weapons... They perished badly... Now its a story of Lexis, the last human survivor living in the Robo world as a robo in disguise and the ways he survived even after being surrounded by the enemies....