Bzrk

Set in the near future, a conspiracy is afoot to create a perfect and perfectly controlled world. The Armstrong Fancy Gift Corporation is a front for the conjoined Armstrong twins, Charles and Benjamin, and the plot to create their own version of utopia.

A shadowy guerilla group known as BZRK form a nascent resistance movement. Both sides develop sophisticated nanotechnology to achieve their goals:

-The Armstrong twins develop the nanobot, a stealth device that latches onto the brains of unsuspecting citizens 

-BZRK's DNA-derived biots are deployed to search out and destroy the insidious bots.  If biots are destroyed, the brain cells of their DNA-donor also die.  Hence the name BZRK.