Gantz is a Japanese series of live-action action horror science fiction films. The Gantz series is based on Hiroya Oku's manga series, Gantz. The films are titled Gantz, the sequel Gantz: Perfect Answer, and a made-for-TV movie titled Another Gantz.
The first film, starring Kazunari Ninomiya and Kenichi Matsuyama, follows two high school students who die and are transported to an alternate world. In this alternate reality, a black sphere gives them a mission to kill aliens.
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Plot
Gantz (2011)
The film follows two young men, Kei Kurono (Kazunari Ninomiya) and Masaru Kato (Kenichi Matsuyama), who are killed in a train accident. After their deaths they find themselves transported to another world, where there exists a black ball known as Gantz. Inside the Gantz is a bald man on life support. They find the Gantz in an unfurnished Tokyo apartment, and it forces them to take part in missions to hunt down and kill aliens. They struggle to figure out whether it is a game, or reality. Kurono and Kato, and other newly dead people must accumulate points by killing aliens, and when they score one hundred points, they can choose to be resurrected, or bring a person of their choosing back to life.