Is ef: A Tale of Memories. - Prologue hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2007 · 1 episodes · PG-13 - Teens 13 or older
Drama, Music
The prologue for ef - a tale of memories, released on a separate DVD two months before the premiere of the TV series.
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