Is Onegai☆Teacher: Himitsu na Futari hentai?
English title: Please Teacher!: Secret Couple
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2002 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Ecchi, Romance, Sci-Fi
Kei and Mizuho are having some marital difficulties, and Mizuho's family decides it's high time for a visit. (Source: ANN)
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