The Apocalypse Has Dawned

Katherine Burns is one tough sniper. Stealthy, smart, basically invincible. But when her group leaves her behind, she's left vulnerable and weak. But just when she thinks it's over for her, she is saved by none other than 10K.
They travel for two weeks before coming across a camp, where Kat finds one she's been missing forever. Kat wants to stay, but 10K decides to leave, which causes Kat to leave, bringing two old friends along.
As they travel, there is nothing but tension between the group. Jealousy and envy is always around. Soon, 10K can't take it anymore, and he leaves.
Kat, of course is heartbroken, but she before she can find him, her old group catches up.
Will Kat find 10K? Will she forgive him for leaving and breaking her heart?
Will Kat realize who she truly loves?

I don't own any characters except for Kat, Zach, Lena, and thank you creative_writer_101 for Rose. Sorry for the summary, I hope the story is better. And, this is basically only 10K. There really isn't any other characters in this fan fiction. In the second book/sequel, they will be introduced. Even if you don't watch the show, this doesn't have any spoilers.

tw// self harm, suicide, heavy religious ideas/beliefs