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

Music · 2012 · 1 episodes · G - All Ages
Music
Blossom is a short work of animation set to music. It is dedicated to memory of Japan's 3/11 Tohoku earthquake and tsunami disaster that "reminds us not to forget those who were directly affected." (Source: Crunchyroll News)
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