Is Sora no Method: Aru Shoujo no Kyuujitsu★ hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Fantasy
Original short anime bundled with the seventh Blu-ray and DVD volume of Sora no Method.
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