What is Gantz?
1.
A mysterious big black ball in a room where people that just died unite. This ball, known as Gantz, controls their lives by telling them to hunt down aliens. Gantz soon gives them weapons and gear to get ready to hunt down the aliens and takes the people in that room to another area where they encounter the alien.
Gantz said my tits are to big.
Gantz said I am a homo, but it's not true.
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2.
Gantz is a sick and twisted
In the real world, the players are invisible to humans and are trapped within the boundary of the playing field. If they stray too far off course, it's game over for them. Their mission is to complete whatever task Gantz gives them or die trying.
"Your lives are now over, you bastards. What you do with your new lives is for me to decide." _ GANTZ
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