After being killed by an oncoming subway train, Kei Kurono (Kazunari Ninomiya) and Masaru Kato (Kenichi Matsuyama) awaken in the afterlife, or so they think. They come to in an unfurnished room surrounded by others who have also been killed in various ways. At the far end of the room lie a mystical black orb that identifies itself simply as “Gantz.” Gantz instructs all present that they are to track down and terminate an extraterrestrial target in an allotted time period. To aid them in their mission, Gantz equips each of them with high tech weaponry and equipment. This scenario is repeated nightly, and functions as a game of sorts. Every time a target is destroyed, Gantz doles out the requisite number of points to all “players” for their participation. The first “player to reach the century mark can either earn their freedom or bring a loved one back from the dead.