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A pair of high school students, Kei Kurono and Masaru Kato, are hit by a subway train in an attempt to save the life of a homeless drunk who had fallen onto the tracks. Following their deaths, Kurono and Kato find themselves transported to the interior of an unfurnished Tokyo apartment.
The pair soon realize others are present and find that they are not able to leave the apartment. At one end of the room there is a featureless black sphere known as \"Gantz\".