The first film, starring Kazunari Ninomiya and Kenichi Matsuyama, follows two high school students who die and are transported to an alternate world.

The film follows two young men, Kei Kurono (Kazunari Ninomiya) and Masaru Kato (Kenichi Matsuyama),[5] who are killed in a train accident.

[7] They find the Gantz in an unfurnished Tokyo apartment, and it forces them to take part in missions to hunt down and kill aliens.

There is also an investigator, Shigeta (Takayuki Yamada), who is trying to understand the Gantz-related violence, and Eriko Ayukawa (Ayumi Ito), an actress who wakes up with a small Gantz ball in her bed.

[12] At the end of the special screening at the Mann's Chinese 6 Theater in Los Angeles, there was a discussion and live interview with both the male leads, as well as a teaser trailer for Gantz: Perfect Answer.

[15] Both films, Gantz and Perfect Answer, were screened in San Diego, California, as part of Comic-con International at the Gaslamp 15 Theater on 22 and 23 July 2011.

[17] Twitch Film published the review of regular reader Brandon Tenold, who stated that the effects were "quite impressive" and called it "a pretty good slice of Japanese-style popcorn cinema.