Is Overlord: Ple Ple Pleiades hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 8 episodes · PG-13 - Teens 13 or older
Action, Comedy, Fantasy, Isekai
Specials bundled with the Blu-ray and DVD volumes of Overlord featuring simplified character animations.
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