Is HenSemi hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2010 · 2 episodes · R+ - Mild Nudity
Adult Cast, Comedy, Ecchi, Seinen
Matsutaka Nanako is a normal university student, who happened to enroll in an Abnormal Physiology seminar. She tries to keep her mental state sound, but other abnormal classmates start to influence her personality... (Source: MU)
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