Charlie would like to tell Nick that he loves him. Nick also has something important to say to Charlie. As the summer holiday ends and the months race on, the friends begin to realise that the school year will come with both its joys and its challenges. As they learn more about each other and their relationships, plan social events and parties and start thinking about university choices, everyone must learn to lean on those they love when life doesn't go to plan.

Nick and Charlie navigate their new relationship, Tara and Darcy face unforeseen challenges, and Tao and Elle work out if they can ever be more than just friends. With exams on the horizon, a school trip to Paris and a prom to plan, the gang has a lot to juggle as they journey through the next stages of life, love and friendship.

Heartstopper tells the story of Nick and Charlie, two British teens at an all-boys grammar school. Charlie, a highly-strung, openly gay over-thinker, and Nick, a cheerful, soft-hearted rugby player, who one day are made to sit together.