Is Onegai☆Teacher: Reminiscence Disc hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2003 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Romance, Sci-Fi
An hour long OVA summarizing the plot of the original Onegai Teacher series. Also bundled with the BD box release of Onegai Teacher.
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