Is Shakugan no Shana-tan III (Final): Final Destruction hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2012 · 2 episodes · PG-13 - Teens 13 or older
Comedy, Parody
Shakugan no Shana-tan: Final Destruction specials bundled with the limited edition second and sixth volumes of the Shakugan no Shana III (Final) Blu-ray and DVD.
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