Is Mai-HiME: Kuro no Mai/Saigo no Bansan hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2010 · 1 episodes · PG-13 - Teens 13 or older
Comedy
Mai invites Reito to go with her to the beach and also says that she prefers him over Tate. But little does he know, that this is actually part of a plan for revenge.
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