Aria the Scarlet Ammo (緋弾のアリア Hidan no Aria?)

STORYLINE

Kinji Tōyama is a student at Tokyo Butei High, a universal educational facility. At this school, students undertake special training in order to learn the path of the Butei, which is a national qualification permitting its holders to arm themselves and capture criminals. The Butei were established to counter the worsening crime conditions, with training in various specialized fields. One day, Kinji decides to quit the Academy, until he is mysteriously attacked by the Butei Killer, a notorious criminal hunting down Butei with passion. The elite Assault prodigy Aria H. Kanzaki comes to his rescue. From this point on, Kinji's future as a Butei changes drastically.

CHARACTERS

 Kinji Tōyama (遠山 キンジ Tōyama Kinji^?)

Voiced by: Junji Majima

Protagonist of the series and a student at Butei High School. He was ranked Level E (lowest combat rank) due to missing the third term's final examination. However, when he is sexually aroused, he enters a state known as "Hysteria Mode" in which his cognitive and physical abilities increase to around thirty times his normal state, which allows him to perform feats of near-superhuman strength and skill, such as accurately shooting up the muzzle of an enemy gun, swinging his knife at supersonic speeds, and accurately shooting enemy bullets out of the air. Hysteria Mode is a genetic trait that all members of the Tōyama family possess, and is stated to be an extremely highly evolved version of the natural male instinct to protect women. As such, when in Hysteria Mode, Kinji's major weakness is the fact that he cannot directly harm women, though he is still able to fight and restrain them without directly hurting them. In addition to this, Hysteria Mode also causes Kinji to develop a suave and seductive attitude towards women, which makes him very attractive to them while in Hysteria Mode. He is currently enrolled in the Inquesta department, though in the past, he was a prodigy (being ranked Level S) of the Assault department, the most dangerous department in Butei High. He starts to respect and have romantic feelings for Aria.

His gun of choice is a Beretta 92F (which was illegally modified to fire a three-round burst; he refers to it as the Beretta Kinji Model). He also wields a butterfly knife. In Volume 6 of the light novel he obtains a black Desert Eagle (which was similarly modified to fire in burst as well as auto) which belonged to his father and a double-edged seax, (modified with a hidden sheath and a reinforced rubber handle) which belonged to Sherlock Holmes, to add to his arsenal.

 Aria Holmes Kanzaki (神崎・H・アリア Kanzaki H Aria^?)

Voiced by: Rie Kugimiya

Female transfer student of Butei High School. An "Assault" department elite rank S (The highest rank), she wishes to recruit Kinji after their encounter. She can wield two guns or two swords at the same time, earning the title of a "Quadra". Her weapons of choice are a M1911 pistol (also known as Colt Government) and two undersized Japanese swords known as Kodachi. The H in the middle name stands for "Holmes" as she is a descendant of Sherlock Holmes himself, and her full name is Aria Holmes Kanzaki IV. Her mother is Japanese and her father is English. Her grandmother is a member of the British Royal Family, having received the title of a "dame". She also starts to have feelings for Kinji but shows it in a different way than other people.

 Shirayuki Hotogi (星伽 白雪 Hotogi Shirayuki^?)

Voiced by: Mikako Takahashi

Shirayuki Hotogi: a female student of Butei High School, childhood friend of Kinji. Enrolled in Butei's special department known as SSR. Butei rank A. She's the current student council chairman, and president of various clubs like the gardening club, handicraft club, and girl's volleyball club. A perfect Japanese beauty according to Kinji, except for one flaw - jealousy, which turns her into a berserker who assaults any girl approaching Kinji. When she finds out that Aria is living with Kinji she goes as far as trying to murder her. She is shown to love Kinji to the point that she will do anything for him. She uses a Japanese sword named Irokane Ayame as a weapon of choice. It is revealed that her name, Shirayuki, was an alias to hide her real name, Himiko.

 Riko Mine (峰 理子 Mine Riko^?)

Voiced by: Mariya Ise

Female student of Butei High School, friend of Kinji. She's enrolled in the Inquesta department; although often considered the biggest idiot in Kinji's class, this is a deliberate facade which breaks down when she is forced into dangerous circumstances. She has a talent for intelligence assessment and, at Butei High, gossip. She enjoys customizing her uniform in an Elegant Gothic Lolita style. She wields two Walther P99s and two knives. Like Aria, she earned the title of a "Quadra".

Near the end of the first volume, Riko reveals that she is a descendant of Arsene Lupin. Her real name is Riko Mine Lupin IV. Riko also reveals that she was the Butei Killer. She appears to have an inferiority complex towards the first Lupin and wanted to overcome him. Her plan was to make Aria and Kinji become a partner so it would create the same battle situation where Sherlock has Watson as a partner before. Defeating both of them would mean she would overcome her ancestor since Sherlock Holmes and Arsene Lupin fought 100 years ago and neither side came out on top. For reasons never made clear, she despises being referred to by her generation's number. It was also revealed that there is in fact a reason for Riko's complex of wanting to surpass the original Lupin, Riko was held captive by Vlad the Sinless and was recently 'let go', under certain circumstances, these were that Riko would have to prove to surpass the original Lupin causing her to have an obsession in the defeat of Sherlock Holmes the 4th.

Her lineage, as well as her middle name, may be an indirect implication that she is the descendant of Arsene Lupin III and Fujiko Mine of Lupin III.

Riko and Aria share several traits: small height, Quadra status, twin-tailed hair and representation of the fourth generation of their ancestral family.

Reki (レキ^?)

Voiced by: Kaori Ishihara

The Snipe department's ace, Butei rank S. Real name unknown. She's habitually taciturn, impassive and indifferent in fashion. She's always seen wearing headphones. Her signature quote is "I am a single bullet. It has no heart. Therefore, it does not think. It just flies straight towards its target", which she always say before she shoots her target. She can shoot anything without missing her target within a 2km radius. Her personal weapon is a Dragunov sniper rifle with an attachable bayonet. She apparently listens to the sound of wind from her homeland (somewhere between Northen Mongolia and Siberia) with her headphones, which are Sennheiser PMX990.

In the middle of volume 3, she eventually tames a wolf in a matter of 5 minutes, which she later named Haimaki, and trains it to be a butei dog. From then on, she lives together with Haimaki in her own room in a girl's dormitory. Kinji visited her room at least twice up to volume 6 of light novel. He commented how bare and simple it is. She also sleeps upright with the Dragunov on her hands, perhaps to prevent an ambush attack according to Kinji. Reki apparently doesn't possess any clothing other than several school uniforms in which she alternately wears, so Kinji bought her a casual one as a present, as a part of his Lima syndrome plan. Reki cleans up nicely. In fact, Kinji was left speechless after witnessing her dressed-up appearance in volume 6.

She plays a minor role in the series, usually providing covering fire to Aria and Kinji when they are fighting at close range or saving them during times of trouble, up until the events at the end of volume 5, when she holds Kinji at gunpoint on the rooftop of Butei High, kissing him and proposing a marriage. She also reveals that she already knows about E-U and Hysteria Mode. Her ancestors were revealed to be Minamoto no Yoshitsune and Genghis Khan.

Apparently before coming to Butei High, Reki was also doing "unrecorded" jobs in Russia and China due to her Butei license. In other words, she worked as a "Sweeper", killing her targets

Jeanne d'Arc (ジャンヌ・ダルク^?)

Voiced by: Ayako Kawasumi

Jeanne d'Arc 30th (also known as Durandal or Diamond Dust Witch) is an ice ability user from I-U (a criminal organization). During the events in Volume 2 of the light novel, she targets Shirayuki in an attempt to kidnap her and force her to join I-U. She is successfully captured via the combined efforts of Aria, Kinji and Shirayuki during the season of Adseard. As one of the conditions of her plea bargain, she was forced to stay in Butei High as a 2nd year international student from Paris enrolled in the Informa department. As a reliable Informa student, Kinji requests her aid whenever he needs a supply of knowledge about a particular case he is involved at. Jeanne and Riko get along with each other very well.

She is one of the few people that knows Kinji's secret. Her personality is serious and cool. Her first comment about Butei High's skirt is: "Unmarried girls shouldn't openly reveal their legs like this!". However, that notion was pretty much shattered because of Riko's strong influence on her, and she has grown a habit of secretly collecting maid dresses, Lolita fashion and other cute dresses.

Although Jeanne is quite extraordinary in terms of fighting skills, beauty and ability, her drawing skills are unimpressive. Despite her strength, she alleges that she is the weakest out of all the members of I-U.