What?  You say you haven’t read Vol. 1?  Don’t matter.  All you need to know is some cyborg ninja dude is traveling thru apocalyptic, cannibal-filled, urban wastelands and flips around gunning people down via dual wielding awesomeness.  Check out chapters 1-3 of Echo Volume 2:  The Taste of Ashes here:  Echo, Volume 2, The Taste of Ashes, Chapter 1