Is Nana Maru San Batsu hentai?
English title: Fastest Finger First
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2017 · 12 episodes · PG-13 - Teens 13 or older
School, Seinen, Strategy Game
As soon as he entered high school, the first year student Koshiyama Shiki was invited to the mysterious Quiz Study Group led by his senpai. What will Shiki run into when being dragged along by his class mate Mari into the dazzling world of competitive quizzes?! (Source: Comic Walker)
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