Is Fushigi no Umi no Nadia Omake Gekijou hentai?
English title: Nadia: Secret of Blue Water Specials
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 1991 · 10 episodes · PG-13 - Teens 13 or older
Adventure, Sci-Fi
Bonus episodes included on the Laserdisc box release of Nadia that expands on the world of the series. They were later rereleased in the DVD and Blu Ray box sets of the series in Japan.
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