The story takes place in a world where humans have begun to develop superpowers and where technology is advancing far more rapidly than before. To combat the villains that seem to be springing up everywhere because of this, people with more powerful abilities (called Quirks) can train to become a licensed hero who combats evil in the name of the greater good. Now, people with more powerful Quirks often aspire to enter Yuuei, an academy dedicated to training Quirk users to become future heroes. The competition is stiff, as the majority of the human population now has a Quirk.
Enter Izuku Midoriya, nicknamed Deku, who is amongst the unlucky few with no Quirk. Despite having no powers, he has not given up on his dream and continues to study both heroes and Quirks in the hopes of one day finding a different path to becoming a Hero. He's often ridiculed for this, especially by Katsuki Bakugou, an extremely powerful Quirk user who's harassed him since childhood. Everything changes one day when he's rescued by his favorite superhero, All Might. Through an odd chain of events, Midoriya proves himself to All Might, who decides to train him and pass his Quirk on to him!