Is Yatogame-chan Kansatsu Nikki hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2019 · 12 episodes · PG-13 - Teens 13 or older
Comedy, School, Shounen
After growing up in Tokyo, high school student Jin Kaito moves to Nagoya where he meets Yatogame Monaka, a fellow student who puts her Nagoya dialect on full display. With her cat-like appearance and unvarnished Nagoya dialect, Yatogame won't open up to him at all. This popular local comedy is increasing the status of Nagoya through observation of the adorable Yatogame-chan! (Source: Crunchyroll)
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