The disease of Hanahaki had just been newly discovered. There was no cure. It was either death, or surgery. Though you would lose the ability to love again. The problem was that it was affecting the hero industry and the number of heroes had gone down, and the crime rate had gone up. Hanahaki was caused by one-sided love. Izuku Midoriya was just a normal boy when one day he discovered he had feelings for a close childhood friend. And sadly enough... He was Infected.