The story takes place 1, 000 years after the death of all of the Z fighters. Come and create your own fighter and became a Z fighter or try and take over the universe.
When you die this is were you will go first from here you can take several roads. Such as take snake way to get to king kais planet and train under him, or you can go and talk to king yamma and give up your body. These are just a few of the locations that you can go to.
It is said that after a fighter has trained for ten thousand years they get one lesson form the grand kai. this place is were every one goes to train after they have trained with king kai.