Arloe Limbleton (Nick Robinson) is your typical high school crush. His good looks to his high grades and respectful manners causes girls to swoon all over him, all except one. She doesn't swoon, instead, she just quietly watches him. Leena Ashford (Chloë Mortez) is a girl who's always breathless. Her quiet personality leads her to being unknown and friendless in a new environment. But she doesn't need any friends, all she needs is her relieving inhaler that she takes everywhere with her. Not because she wants to. Simply, because she... needs to. So what happens when the hottest guy in school notices the lonely girl in his class who's always sick? What will happen when neighbors exceed the fence that separate two completely different lives? Witness the painful love story to the very end in the perspectives of Leena Ashford and Arloe Limbleton.