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Also known as 'Aria the Scarlet Ammo' - Hidan no Aria is a Japanese light novel series by Ch?gaku Akamatsu. An anime adaptation began airing on April 14, 2011 and concluded on July 1, 2011.
Buteir High teacher Umeko Tsuzuri takes Kinji, Aria, Shirayuki, Riko, Reki, Jeanne, and Muto to a secluded mountain onsen run by a former Butei for special training. During their long hike to the lodge, Aria, Shirayuki, and Riko fight over Kinji. While in the hot springs, the girls compare their chest sizes, much to Aria's dismay. Aria and Jeanne later have a ping-pong match using their special abilities. Later, Muto is frightened upon seeing Jeanne temporarily turned into a chrysanthemum statue. She admits to losing memory between leaving the game room and ending up outside. Muto disappears that night, and the others later find him dead. Shirayuki then notices Tsuzuri and the landlady have been hanged. The group then spots a mysterious young boy and chases after him inside a haunted room. All of a sudden, the students find themselves back inside the minivan just before they arrive the inn. While each member of the group remembers what happened up to their individual 'deaths', the landlady and everyone else not in the group do not recall anything and think the group are acting really strangely. Yet, the knowledge that the group learned from their mutual experience, such as events from the landlady's past, seems to be true. What exactly happened to the group remains a mystery.
Kinji T?yama is a student at Tokyo Butei High school, where special detectives known as Butei are trained to become mercenaries. While riding his bike to school after missing the bus, Kinji is chased by a remote-controlled Segway armed by an Uzi, telling him that a bomb has been attached to his bike which will explode if he slows down, also threatening to shoot him if he jumps off. Kinji is saved a mysterious twin-tailed girl named Aria H Kanzaki. As the two end up pinned down in a gym storage locker as more Segways appear, Aria fends them off, sticking her chest right in Kinji's face while doing so. The sexual arousal causes Kinji to enter his 'Hysteria Mode', where he manages to perfectly destroy the Segways, as well as counter Aria's moves when she complains about him being a pervert. As Kinji finally arrives at school, he learns that Aria has become a transfer student in his class. Later that day, Aria comes to Kinji's house and declares him her slave.