Pearly Gates Beyond Our Universe

Five school kids get swallowed by the silver screen by accident while watching a film and transported into a universe where everything is identical to that of our universe except that its time is ahead of ours. There they’ve learnt what the future world is like and what the human beings in our present world need to do in order to make our world become identical to the future world one of these days in our future. But before they’re able to return to our world, the existence of the entire future universe is being threatened by antimatter.