In order to revive his dead friend Kato Masaru (Kenichi Matsuyama) and other deceased people, Kei Kurono (Kazuya Ninomiya) and his comrades have been fighting various aliens for 5 months to win more points. In this process, newcomers continue to join Gantz, and the newcomers seem to have an inexplicable familiarity with this seemingly strange alien world. One day, Kato, who should have died, suddenly appeared in the real world, which puzzled Kurono and others. The subsequent battles also showed many strange things. For example, in the battle with the black-clad aliens, both the enemy and us appeared in the crowded subway car at the same time, causing blood to flow and causing huge casualties. The boundary between reality and fantasy began to blur, and the aggressive aliens were also preparing to launch a final attack on Gantz's headquarters... This film is adapted from the manga of the same name by Hiroya Oku.