It's about......
(my guess)
Purgatory
"When two bus crash survivors awake to discover that they are the only people left in their small town, they must form an unlikely alliance in a race to unravel the truth behind their isolation. As strange events begin to unfold, they start to question whether the town they know so well is really what it seems"
Seems likely with the movie title ("After") that it's about the afterlife, the bus survivors are really dead and likely to be in the state b4 hell or heaven, aka Purgatory. Perhaps there actions here will result in one going to heaven and the other going to hell.