My Hero Academia is one of the most popular action manga and anime series out today, and in its five year tenure of running in Shueisha's Weekly Shonen Jump one of the most popular spins among fans was the surprising fantasy world series creator Kohei Horikoshi imagined his characters into. This fantasy alternate universe popped up in both the original manga series and in one of the ending theme sequences for the anime, and fans haven't stopped thinking about them since.