Hidan no Aria: Butei ga Kitarite Onsen Kenshuu  Play Trailer

Aria the Scarlet Ammo Special, Hidan no Aria Special, 緋弾のアリア 武偵が来たりて温泉研修, Hidan no Aria - Butei ga Kitarite Onsen Kenshuu, Aria the Scarlet Ammo - Butei's Going on a Hot Spring Training Camp

The narrative unfolds at Tokyo Butei High School, where students are trained as armed detectives known as "Butei." Kinji Tooyama is a second year student with a unique talent that he keeps hidden to lead a normal life. However, during his commute to school, he gets caught in an explosion and meets H. Aria Kanzaki, the strongest S-Rank Butei student in Assault Studies.