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

Special · 2007 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Supernatural
A promotional short special for the movie where Shana and Yuji explain different terms from the show.
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