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

TV · 2022 · 13 episodes · PG-13 - Teens 13 or older
Action, Sci-Fi
The story is set in a world where unique kaijuus suddenly begin to appear in various places around the world. Members of the United Nations Monster Observatory will explore a world where kaijuus with great powers and humankind live together. (Source: MAL News)
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