Is IS: Infinite Stratos 2 - Hitonatsu no Omoide hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2013 · 1 episodes · PG-13 - Teens 13 or older
Action, Comedy, Harem, Sci-Fi
An extended version of the second season's first episode, which is under the same title.
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