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Gantz:O

There's a room somewhere in Tokyo. There is a black sphere in that room. People who should have died are moved to the room on a regular basis. There, the sphere gives them special suits and weapons and sends them on a mission to kill aliens here on Earth. While these missions are going on, most people don't know about them. Most people who take part in these missions die. The sphere makes all the decisions, which is not at all nice. It is called Gantz.

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