ar - naruto becomes one with the demon & destroys everone instead of becoming the hero  au - naruto lives in todays modern era and owns a restaurant
alternate reality - used in fan fiction for similar reality with different version of events, as where as au alternate universe is different time & place
"ar - naruto becomes one with the demon & destroys everone instead of becoming the hero  au - naruto lives in todays modern era and owns a restaurant" What is the definition of "ar"?