Is Jikuu Tantei Genshi-kun hentai?
English title: Flint the Time Detective
No
Rated PG (Children) on MyAnimeList and not tagged as Hentai.

TV · 1998 · 39 episodes · PG - Children
Adventure, Comedy, Fantasy, Mystery, Sci-Fi, Time Travel
It is the 25th century. The dark lord has 'infected' history with time-devices that could damage history beyond repair. Genshi and his father lived in the prehistorics when they got turned into fossiles. They are discovered and Genshi gets turned back to his original state. With the help of his father, a boy Tony and a girl Sara he has to travel trough time to bring the time-devices back to the land of time so history will be saved. (Source: ANN)
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