The Future of Us is written in first person. It's also written in the present tense—we hear what's happening in the moment—and this makes the story feel active, like we have a front row seat as everything unfolds. But there's a bit of a twist at work in this book: There are two first-person narrators. Emma and Josh are both telling us their stories, taking turns by chapter.
Having two narrators is cool because we get to be on the insides of two different minds. It's kind of like we're friends with both of them and hear both sides of the story—and because they're both telling us the story, as readers, we get to see a bigger picture than we otherwise would. There's something a little ironic about this in that the book communicates really well with readers, while our two main characters struggle with, well, communication.