Where is Gantz? o.o

Hi all I am new here,

I was searching for a better manga site to replace the one I was using till now & after some research I decide to use Manga Here - Read English Manga Free Online. Manga is Here! so I start replacing all my old links (I have all the manga I read every week 20 in total in a browser folder) with the ones from this site & everything was going fine until Gantz turn came & I couldn't find it anywhere ~.~

I was certain at some point that in this site I could find anything I wanted so that was very disappointing, can some1 explain me why mangahere doesn't have this amazing manga in the list? I am sure that all the veteran manga readers out there know very well this manga & how awesome it is, so what's the reason behind this? :/