Is Honto ni Atta! Reibai Sensei hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2011 · 22 episodes · PG-13 - Teens 13 or older
Comedy, School, Shounen, Supernatural
The story revolves around Kibayashi, a teacher whose hobby is speaking with the dead and whose special talent is exorcism. She seems to know everything about the other world, yet nothing about our own. (Source: AniDB)
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