Is Hiyoko no Basket Movie: Last Game 0401 hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

ONA · 2017 · 1 episodes · G - All Ages
Comedy, Parody, Shounen, Sports
2017 April Fools' Day event where the Kuroko's Basketball bird mascots fill in for the characters in a trailer for the Last Game movie. (Source: ANN)
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