Is Gintama: Monster Strike-hen hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2019 · 2 episodes · PG-13 - Teens 13 or older
Action, Comedy, Parody, Samurai, Shounen
Collaboration anime between Gintama and Monster Strike.
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