Several months after the events of Gantz 1, Kurono faces an impending alien invasion under the order of Gantz, a mysterious giant black orb. As he closes in on the magical 100 score to resurrect other players, young pop star Eriko is being secretly ordered by Gantz to carry out assassinations, and cop Shigela inches closer towards finding out the truth about the invading aliens. As the missions get increasingly dangerous, Kurono discovers that the endgame for Gantz is quickly approaching with a massive bloody showdown with the aliens.