Is Aria the Avvenire hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 3 episodes · G - All Ages
Iyashikei, Sci-Fi, Shounen, Slice of Life
Now that Akari Mizunashi is a Prima Undine and head of the Aria Company with her own apprentice, Ai Aino, she cannot help but reminisce about her time as a Single. She has new responsibilities and much less time on her hands, but these changes bring with them new forms of miracles that Neo Venezia can give. Growing up into new roles is hard, but Akari can always count on the friends she has made on Aqua in times of need. [Written by MAL Rewrite]
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