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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 and Aria give the rosary to Riko who does not keep her promise to testify and instead decides to attack the two of them so as at to defeat them and surpass her ancestors. Sayonaki-sensei then appears behind Riko tasering her until she becomes subdued and then steps on her and causes her pain. Sayonaki-sensei turned out to be the demon, Vlad and attacks both Aria and Kinji. Kinji saves Riko and tries to fight Vlad with Aria. The only way to kill him is to simultaneously shooting his four weak spots, but they fail to find the last one and Kinji is knocked over the edge of the roof they are fighting on. Riko saves him and Aria and helps him re-enter hysteria mode so that he can make a plan to kill Vlad. Kinji then figures out the final weak-spot, his mouth and the three of them kill Vlad. Afterwards, Riko testifies so that they can lower Aria's mother's sentence.