Is Mahoutsukai Nara Miso wo Kue! hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2012 · 1 episodes · PG-13 - Teens 13 or older
Fantasy, School
A world where the existence of magic has been known for a century as a mysterious power to rival science. However, the discovery of MISO — the Material of an Impediment to the Sorcerer's Orders — made magic into not a special power, but a technique that can be raised. One morning, while Shōta Hacchōya (a high school boy attending a magic academy) was tasting miso soup, a princess of Majieeru suddenly breaks in. Majieeru happens to be the birthplace of magic. (Source: ANN)
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