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)[Written by MAL Rewrite]
Hidan no Aria: Butei ga Kitarite Onsen Kenshuu, Hidan no Aria Special, 緋弾のアリア 武偵が来たりて温泉研修, Aria the Scarlet Ammo Special
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