Is Shakugan no Shana-tan Movie 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
Adventure, Comedy, Parody, Supernatural
Shana-tan special bundled with the Shakugan no Shana Movie director's cut special collection DVD.
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