Is Sono Toki, Kanojo wa. hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2018 · 12 episodes · PG-13 - Teens 13 or older
Drama, Romance
The anime takes place in Fukuoka and follows the love lives of four female protagonists as high school students, college students, and as working adults. (Source: ANN, edited)
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