They Both Die at the End by Adam Silvera

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.