Is High Score Girl: Extra Stage hentai?
English title: Hi Score Girl: Extra Stage
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2019 · 3 episodes · PG-13 - Teens 13 or older
Comedy, Love Polygon, Romance, School, Seinen, Video Game
Four years after they first met, Haruo Yaguchi , Akira Oono, and Koharu Hidaka remain the best of friends. Tensions start to build up as Akira's teacher, Gouda Moemi, becomes stricter than ever before, and Hidaka develops feelings for Haruo. Though he may not be the most composed and thoughtful person around, he has within him the one thing that started it all: his unconditional love for video games. [Written by MAL Rewrite]
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