Is Attouteki Vivid Days hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Music · 2019 · 1 episodes · G - All Ages
Music
Official music video for Nanami Yoshi.'s song Attouteki Vivid Days. Nanami is a virtual idol whose song was also used as the ED to Kenja no Mago. A version with watermarks was posted to Avex Entertainment's official YouTube channel on May 17, 2019; it was stated to be the full-length music video. This was meant to advertise her CD+DVD going sale of the same name on June 19, 2019. The accompanying DVD will feature a clean version of the music video.
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