One day, Paul collapses in the middle of the playground. He finds out that he’s diabetic. From then on, he has a sensor in his arm and an insulin pump. But all Paul wants is to be normal. So he throws his insulin pump down a sewer. A few hours later, his heart starts beating faster, his body is shaking, and he ends up in the hospital. As he learns more about the disease, he gets closer to Anaïs, his school friend, and Arthur who, despite his illness, always makes everyone at the hospital laugh.