Is Gunslinger Stratos hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2014 · 1 episodes · PG-13 - Teens 13 or older
Action, Sci-Fi
Animated movie of the popular online multi-player double gun action game Gunslinger Stratos 2 which was streamed on the official YouTube channel of Square Enix.
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