Is Aldnoah.Zero: Ame no Danshou - The Penultimate Truth hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2025 · 1 episodes · R - 17+ (violence & profanity)
Mecha, Sci-Fi, Space
Episode 24.5 released with the Blu-ray Box.
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