Is Vivy: Fluorite Eye's Song - To Make Everyone Happy With My Singing hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

TV Special · 2021 · 1 episodes · R - 17+ (violence & profanity)
Action, Music, Sci-Fi, Suspense, Time Travel
Recap of all 13 episodes of Vivy: Fluorite Eye's Song.
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