They both die at the end
Adam Silvera (Author)
"On September 5, a little after midnight, Death-Cast calls Mateo Torrez and Rufus Emeterio to give them some bad news: They're going to die today. Mateo and Rufus are total strangers, but, for different reasons, they're both looking to make a new friend on their End Day. The good news: There's an app for that. It's called the Last Friend, and through it, Rufus and Mateo are about to meet up for one last great adventure--to live a lifetime in a single day.'"-- Amazon
Print Book, English, 2017
First edition
Quill Tree Books, an imprint of HarperCollins Publishers, New York, NY, 2017