Midoriya never got in to UA and after the war Japan as a nation fell and it became a wasteland or a treasure grove for those who dare to scavenge the lands. Like our protagonist with his quirk Dodge has a percentage change to not get hurt when hit. (PayDay 2 Dodge build basically) He moves across the wasteland as those who fear go to the safe zones like UA or Shiketsu. (Has Manga Spoilers)