Is Aria the Natural: Sono Futatabi Deaeru Kiseki ni... hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2006 · 1 episodes · G - All Ages
Iyashikei, Sci-Fi, Shounen, Slice of Life
Short episode entitled "A Miracle Of Us Being Able To Meet Again", which can be also considered as "Aria the Natural" episode 0.
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