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You can stream GANTZ (2004) on Crunchyroll with a subscription.

If you are chosen by the bizarre black sphere known as the Gantz, you are already dead—yet you might be able to reclaim your mortality. First, the Gantz demands that you undertake brutal missions of madness, killing aliens hidden among the population. It is your only chance and you have no choice. You must play this disturbing game. And if you die again—and you likely will—it’s permanent.

Kurono finds himself trapped in a lethal game where survival requires hunting grotesque aliens hidden in plain sight. Every mission offers a slim chance at life, but the cost is a constant, violent struggle against the unknown.

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