Is 22/7: 8+3=? hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2020 · 1 episodes · PG-13 - Teens 13 or older
Idols (Female), Music
Thirteenth episode included in sixth Blu-ray volume. This episode centers on the story of Mikami Kamiki, Yuuki Toujou, and Tsubomi Hiiragi. (Source: Official Website)
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