Hero kurono see elementary school friend Kato WINS in the Metro home.
Was hit by a train came along with strong Kato's sense of Justice is trying to help homeless fell onto the tracks to help containing kurono will die.
The next moment, they were in one room of the apartment.
People who would have died as well as had collected there.
Mysteries in the middle of the room's big black balls. They are called the Gantz sphere that stars who 'beat' directed and will transfer to another location.