Is Comet Lucifer: Garden Indigo no Shasou kara hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

ONA · 2016 · 12 episodes · G - All Ages
Adventure, Comedy, Fantasy
Super deformed flash anime shorts. Half were streamed on Bandai’s official youtube page and half were bundled with the DVD/Blu-ray release of the main show.
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