Back too school

Sage Rider a Senior at Stonebridge Highschool is just waiting for her Junior year in highscool to be over
But soon Disaster strikes and an apocalypse only believed to be apart of movies and fiction Rose out of nowhere.
Sage works alone and stays alone she brings no one with her nor sticks or makes friend with anyone...not after the incident and definitely not during her last year in highscool.
but certain circumstances cause her and her classmates to grow close together and bond over there pasts.
Can Sage learn to trust and keep those near her protected or will she let them down and push them away causing them to disappear like the rest.