Despite having seemingly returned to their normal lives, Kei Kurono, Masaru Katou, and Kei Kishimoto are forced back into the lethal game after Gantz's recent activity. The black sphere continues to summon recently deceased people to fight alien invaders. And having survived the two previous encounters, the trio are more than prepared for the upcoming missions. As they progress through the tournament's stages, the three proceed in their attempt to earn 100 points, which is said to be the only way to leave the parallel dimension for good. However, with the constant onslaught of alien invaders and the threat of imminent death, they must first focus on the task at hand—immediate survival. Kurono Kei and his ex-elementary school classmate, Kato Masaru have survived the first two ordeals that the unknown black sphere Gantz has sent them through. Exploding body parts, struggling to stay alive till the last seconds and seeing your fellow comrades fall in a pile of blood and gore are norm to them now. They are aware now that Gantz can call them up along with any new deeds, at any time for another confrontation with aliens.