everyone, where can i download manga gantz complete volume??

Answer 1

a quick search at http://www.stoptazmo.com/

revealed a link to the Gantz manga
http://stoptazmo.com/gantz/

so that's where you can download Gantz manga chapters. (a number of chapters constitute a volume)

if you feel up to it , and know how to use irc, you can download it by volumes.
use http://www.gotlurk.net/ instead