Is Katekyou Hitman Reborn! x ēlDLIVE Special hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2016 · 1 episodes · PG-13 - Teens 13 or older
Shounen, Super Power
Short anime special for Katekyou Hitman Reborn! and ēlDLIVE that exhibited at Akira Amano Illustration Exhibition between July 28 to August 9.
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