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

Special · 2016 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Harem, Romance
Picture drama included on the IS: Infinite Stratos 2 Blu-ray BOX.
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