In a world where the boundaries between life and death are blurred, a group of recently deceased individuals are brought back to life and tasked with fighting against an army of monsters in Tokyo and Osaka. Equipped with high-tech weapons and suits, they must work together to defeat the monsters and uncover the truth behind their newfound existence. As they battle their way through the cities, they come across unexpected allies and enemies, all while trying to stay alive long enough to complete their missions. But as the stakes grow higher, they begin to question what it truly means to be alive, and what they are fighting for. Will they be able to overcome their challenges and emerge victorious, or will they fall prey to the monsters that threaten their very existence? Find out in "Gantz: O", a thrilling sci-fi action film that delves deep into the human condition.

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Some movies that have similar genres and were produced around the same time as Gantz: O include Spider-Man: Into the Spider-Verse, Kingsglaive: Final Fantasy XV, Justice League Dark: Apokolips War, Mobile Suit Gundam Hathaway, Injustice, Dragon Ball Super: Broly.