Is Nobunaga-sensei no Osanazuma hentai?
English title: Nobunaga Teacher's Young Bride
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

TV · 2019 · 12 episodes · R+ - Mild Nudity
Comedy, Ecchi, Harem, Romance, School, Time Travel
"One day, a girl who loves me will suddenly appear before me"—Middle school teacher Nobunaga has always been dreaming of such a gal game-like situation. However, the one who appeared before him was Kichou, a 14-year-old girl who proclaims herself as his wife. Appearing to have arrived from the Sengoku era, she mistakes Nobunaga as Nobunaga Oda and urges him to conceive a child with her. Thus begins the age-difference love comedy between a gal game-loving teacher and a Sengoku era expert princess. (Source: MAL News)
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