Story is here

This takes place 20 years after the defeat of world 3. A new evil has arisen " The Shadow Force Delta". Navi teams from all over the world compete in nation wide tournaments hope to drive these evil fiends out of hiding. This is played as free-fights and serious battles. Free fight don't get affected if your navi is deleted. Serious battles will be affected if you want your navi to be deleted.

You can choose to be on the side of good or evil, or you may have characters on both sides.