Need help finding a story

Hey guys, I don't really know if this is the appropriate place to ask this question, but I'm trying to find a story that I read last year.

I can remember it was about to kids in high school, and the guy was looking to become like a priest and he took this girl to prom and the school was destroyed by a tornado or something like that. And after the disaster they were like the only ones that survived and they toured the us going to talk shows and stuff. I can't really remember a lot, I remember it being quite long so I figured it'd be in novels and novellas or something like that.

Thanks for taking the time to read this, and any help is appreciated