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

OVA · 2011 · 1 episodes · PG-13 - Teens 13 or older
Drama, Supernatural
Anemone is a story about a girl who strays into a world of wonder. She goes deeper into her internal world—her heart—and, in the end, retrieves an important thing that she lost. (Source: Official site)
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