Is Fate/Grand Order: Fujimaru Ritsuka wa Wakaranai hentai?
English title: Fate/Grand Order: You've Lost Ritsuka Fujimaru
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2023 · 33 episodes · PG-13 - Teens 13 or older
Comedy
Ritsuka Fujimaru—humanity's last master. It would not have been possible to restore humanity without him. However, he does have a shortcoming... he is far too honest! A slapstick comedy in which Fujimaru's simple questions sway the heroic spirits! (Source: MAL News)
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