Is Bishoujo Senshi Sailor Moon: Sailor Stars - Hero Club hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 1996 · 3 episodes · PG-13 - Teens 13 or older
Adventure, Comedy, Drama, Mahou Shoujo, Romance, Shoujo
Compilation of Sailor Stars with added narration.
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