Is RoboMasters the Animated Series hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2017 · 6 episodes · PG-13 - Teens 13 or older
School
The series will depict college students as they prepare and participate in a RoboMasters tournament. (Source: ANN)
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