Horne, Marc
Tokyo Zero (2007)

Why is a young Westerner living in a seedy Tokyo apartment with a crew of crazed cultists? To end the world, of course...
Michael Blake is in Tokyo to help out with the end of the world. Living in the Tokyo of the gangs, the losers and the outsiders, Blake and a cell of Japanese psychopaths plot to unleash a new kind of bio-chemical horror on an unsupecting populace of daydreaming salary-people.
"Cyberpunk meets a Tarantino Universe where every moment is filled with non-stop action and plot twists."
 
Author's website: marchorne.wordpress.com