Is Shakugan no Shana: Friagne & Marianne no Naze Nani Shana! Nandemo Shitsumonbako! hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2006 · 8 episodes · PG-13 - Teens 13 or older
Comedy, Supernatural
A series of short specials where Friagne and Marianne explain different terms from the show.
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