They both die at the end - A. Silvera

On September 5th, 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. Another beautiful, heartbreaking and life-affirming book from the brilliant Adam Silvera, author of More Happy Than Not, History Is All You Left Me, What If It's Us, Here's To Us and the Infinity Cycle series.