Outcast — Aileen Fish

When the world collapses, the only person who comes looking for Niki Mathers is the loser who made fun of her in high school. JC Phillips saves her life, so she can't really tell him to get lost. And he is keeping her from being alone at the end of the world… JC will never forgive himself for choices he made the night before the earthquake. Rescuing the girl he's been crushing on for the past year doesn't bring atonement. Maybe making the world safe for Niki will take away his guilt. The world they know is dying. All they want is to find their place in it before it does.