Is ARP Backstage Pass hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2020 · 10 episodes · PG-13 - Teens 13 or older
Idols (Male), Music
ARP: A 4-member dance and vocal group created by the latest AR technology. This popular group got their start with Avex, and are unique for their interactive concerts which combine highly-skilled song and dance routines with a format that changes based on how much the fans are cheering them on. (Source: Crunchyroll)
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