Is Immoral hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2005 · 2 episodes · Rx - Hentai
Hentai
A school doctor comes in possession of a sexual hypnotic spray that inhibits girls to succumb to sexual desires. One after another, high school girls fall prey to the school doctor's sex schemes turning them into sex slaves.
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