Is Hidan no Aria: Butei ga Kitarite Onsen Kenshuu hentai?
English title: Aria the Scarlet Ammo Special
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2011 · 1 episodes · PG-13 - Teens 13 or older
Action, Comedy, Mystery, Romance
The story takes place in Tokyo Butei High School, a special school where armed detectives—"Butei"—are trained to use weapons. Kinji Tooyama is a second-year-student who has a special ability, but he keeps it a secret to maintain an ordinary, peaceful life; however, when he gets caught in a bombing on the way to school, he encounters H. Aria Kanzaki, the most powerful S-Rank Butei student in Assault Studies. (Source: ANN)
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