Is Bokutachi wa Benkyou ga Dekinai: Nagisa ni Usemono Arite Senjin wa Enzen to [X] Suru hentai?
English title: We Never Learn: BOKUBEN - The Predecessor [X] with Elegance with the Missing Item on the Beach
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2019 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Harem, Romance, School, Shounen
The episode adapts chapters 48 and 49, which follow Yuiga and Asumi going on a fake date, and Yuiga encountering his teacher Mafuyu Kirisu after she accidentally loses her swimsuit top. (Source: MAL News)
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