Is Majimoji Rurumo: Kanketsu-hen hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2019 · 2 episodes · PG-13 - Teens 13 or older
Comedy, Ecchi, School, Shounen, Supernatural
Bundled with the with the ninth limited edition volume of the Majimoji Rurumo: Houkago no Mahou Chuugakusei manga.
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