Is Sword Art Online II: Debriefing hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV Special · 2014 · 1 episodes · PG-13 - Teens 13 or older
Action, Adventure, Fantasy, Video Game
Recap episode of the Phantom Bullet arc, also known as Episode 14.5.
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