Is D4DJ Double Mix hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV Special · 2022 · 1 episodes · PG-13 - Teens 13 or older
Music
A special episode focusing on the story of Merm4id and Rondo, including a new, joint performance by the two groups.
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