Is Dragonaut: The Resonance - Kotou - Tozasareta Kyousou hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2008 · 1 episodes · PG-13 - Teens 13 or older
Mecha, Romance, Sci-Fi, Space
An unaired 26th episode that will be in the final DVD.
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