Is Katarina to Manabou hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2020 · 9 episodes · PG-13 - Teens 13 or older
Comedy
Short specials posted on the official Twitter account focused on main cast of Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta...
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