Gantz - Manga Series [001 - 050]

A pair of high school students, Kei Kurono and Masaru Kato, are seemingly run over by a subway train, after saving the life of a homeless drunk who had fallen onto the tracks. Following their untimely deaths, Kei and Masaru find themselves transported—alive and well—along with a number of people who have also just died, to the interior of an unfurnished Tokyo condominium from which the Tokyo Tower may be seen—and none of them are able to leave. At one end of the room is a featureless black sphere we later learn is called "Gantz". By way of green text that appears on the surface of the sphere, Gantz informs those present that their lives have ended. The following words appear on the black sphere's surface: "Your lives have ended. What you do with your new lives is entirely up to me. That's the theory, anyway." (The ADV translations have it as "Your lives are over, you bastards. What you do with your new lives is entirely up to me. So there you have it.") The sphere then opens up to reveal suits that, when worn, amplify the user's attributes, such as strength, speed and agility. Along with the suits are various high-tech weapons with different uses for different situations. Next, information on the Gantz Targets appear on the surface of the sphere, shortly before the Gantz Team are transported to the location of the mission.

In addition to the weapons, suits, and scanners, Gantz holds what appears to be a muscle-bound bald man on life support in the center of the ball. The true identity and purpose of this man is never revealed. The series consistently introduces new characters. Most of them are killed off almost as quickly as they appear, though at times a stable cast of veterans forms.

The first season, known as the "First Stage", was heavily edited on Japanese TV, but the second season ("Second Stage") remained uncut. The Gantz anime is often criticized for its ending and pacing problems. The anime was made while the manga was still in early production, and thus Gonzo had to produce episodes at an irregular pace, and end the series in a manner a number of fans found unsatisfying—a common occurrence when an anime is made from a manga that has not finished its run.