Midoriya inherits the superpower of the world's greatest hero, but greatness won't come easy. 
What would the world be like if 80 percent of the population manifested superpowers called "Quirks"? Heroes and villains would be battling it out everywhere! Being a hero would mean learning to use your power, but where would you go to study? The Hero Academy of course! But what would you do if you were one of the 20 percent who were born Quirkless? 
Knowing that All For One has put a target on his back, Midoriya has left U.A., hoping to draw the villains away from everyone he cares about. But his friends know the newest bearer of One For All shouldn't handle this burden alone, so they set out to bring him back. The forces of good need every hero they can find as the unfolding crisis in Japan now has global ramifications, with even foreign heroes itching to join the fight...