The story takes place in a superhuman society where about 80% of the world's population has supernatural powers. In a world filled with chaos, the "chosen" profession of "heroes" protects people from accidents, disasters, and enemy villains who misuse their "quirks".
On the other hand, some people cannot help but save those in front of them, even if they are not "chosen".
This is the story of those illegal heroes, the Vigilantes.