College student Kei Kurono (Kazunari Ninomiya) witnesses his childhood friend Kato (Kenichi Matsuyama) attempting to help a drunk who has fallen onto the subway train tracks and jumps in to help him. However, both are run down by an oncoming train and are transported to an apartment. In the center of the living room is an enigmatic black orb known as ‘GANTZ’. GANTZ forces each of them to take part in a mission to hunt down and kill aliens, providing them with equipment and weaponry. Is this world, which tests their will to survive, a game or reality?
Originally created by Hiroya Oku in 2000 Gantz has taken Japan and other parts of the world by storm. At present count the 29 manga volumes have sold over 13.5 million copies worldwide and it has been licensed for a number of countries including the US by Dark Horse comics. The manga inspired a 13 episode anime series and a second 13 episode series that followed that as well as a novel, a Playstation 2 game and now a pair of live action movies.
Source : mania.com