From the introduction: My Hero Academia, world of heroes and villains doing battle within the concrete jungles of what appears as modern day metropolises. Long, long ago this world was much like ours until a baby was born with the ability to glow. One after another, humans were born with special abilities that would later become known as “Quirks.” The world descended into chaos as the definition of humanity blurred. Now in the modern era, stability and peace have been restored. Humans with Quirks have become commonplace, making up 80% of the world’s population, with laws drafted to account for them.