Is One Piece: Glorious Island hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2012 · 2 episodes · PG-13 - Teens 13 or older
Action, Adventure, Fantasy, Shounen
A prologue to One Piece: Film Z released exclusively on smartphones through the broadcasting service NOTTV.
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