Himegami Aisa

Himegami Aisa (姫神 秋沙) is a recurring character in the Toaru Majutsu no Index. She is a Gemstone and possesses the ability "Deep Blood," which attracts and kills vampires.

Apperances
Aisa looks like any normal teenage girl. She has long, straight, black hair, and is often seen wearing her |shrine shrine maiden clothes. After the events of the second volume, she begins wearing a cross necklace given to her by Necessarius, so vampires will not get attracted to her blood.

Personality
She is a quiet, young girl with a rather blunt personality, generally soft-spoken and sometimes shy. She can be as gluttonous as Index, which is shown when she was trying to buy out all hamburgers at one restaurant. Because of her ability, it has made her miserable because her friends and family were killed by it. Ever since Touma saved her life, Aisa started to have feelings for him, which is ironic as she once joked that Touma's life was like a dating sim.

She also has a kind and considerate side, shown during the Daihaisei Festival after she was recovering from the near-fatal injury caused by Oriana Thompson, she once thought about leaving Touma and everyone else since she seems to only be a burden to Touma. She thought she didn't have any special talents that could help Touma, nor was she the kind of person that could help others just by her presence like Index. Though Index quickly told her it wasn't true, as Himegami is everyone's friend and a valuable person to everyone who was worth saving.

Background
Known as "Deep Blood," she has the ability to attract and kill vampires, resulting in many of her friends dying. This prompts her to go to Academy City, hoping to find a way to get rid of her powers. She meets the alchemist Aureolus Izzard and cooperates with him because he told her that her blood can be used to save the life of a person he cared for (Index) in return for helping her get rid of her powers.

According to the novels, Himegami's dream isn't to live a normal life, but to become a "magician" like those in fairy tales who can even disregard the laws of nature, to save people that have been abandoned. She has this dream because her village was all turned into vampires by a passing vampire that was afraid of her ability, and decided to turn everyone into vampires to kill Himegami, but in the end they, the intruding vampire, her friends, her parents, all were killed by the ability Deep Blood. At the start of Volume 2, she joined Aureolus for the short-term goal of sealing her power so she can't kill vampires, and afterward to continue the dream of becoming a magician.

Deep Blood Arc

 * Main article:Deep Blood Arc

Aisa is first introduced in the Deep Blood Arc. She becomes a major concern to the Magic Side, as she has been apparently abducted by Aureolus Izzard, a powerful alchemist who has taken over Misawa Cram School and an enemy of the Roman Catholic Church. With the situation complicating, Stiyl Magnus is recalled back to Academy City to rescue her. Even though Academy City is unable to intervene with the Magic Side's affairs, Aleister Crowley allows Stiyl to borrow Kamijou Touma's help, as he deems him as no threat to the Magic and Science Side's secrets.

Aisa is first seen in Macronall Hamburger, having spent all her money on hamburgers and unable to go home. Touma and Index meet her, where she tries to borrow money from Touma, but is refused and Index argues with her for claiming to be a magician without proof. She is later escorted by teachers of Misawa Cram School, making Touma suspicious.

Touma later realizes, after being involved by Stiyl, that the person they are trying to save is Aisa. Aisa meets Touma again within the confines of the school and tells her the reason why she joined Aureolus.

When Aureolus learns Index's life was already saved by Touma and tries to kill him, Aisa attempts to defend Touma, which prompts Aureolus to use his alchemy to try to kill her as she is now useless to him. Her life is saved by Touma who dispels the spell on her with his right hand. When she asks Touma about why he saved her, he told her that he did not have a reason to rescue her. After the incident, she starts to live with Touma and Index but later moves to Tsukuyomi Komoe's Tsukuyomi Residence.

Sisters Arc

 * Main article:Sisters Arc

She is given a British Puritan cross that is able to seal off her ability, which, according to Index, is the bare minimum of what makes up a Walking Church barrier. She subsequently becomes a student at Touma's school and is in his class.

After the events of Volume 2, Necessarius gave her a Celt cross-pendant from the "Walking Church," which can generate and maintain a minimum barrier to seal her ability. Since then, she has transfered to Touma's school in order to be around him, and in doing so, hopes that if she stays with him she'll achieve her dream and get him to notice her more.

During the Sisters Arc, she is first shown trying to find a way to get rid of the fleas on Sphynx, with her suggesting to use an insecticide spray on Sphynx. When Touma brings Misaka 10032 to his dormitory, she comments on him being a protagonist of a dating sim, and how he raises flags and inevitably gather girls around him. She is later seen with Komoe and Index, partaking in various activites such as eating and going to a certain bathhouse, while hearing Komoe's explanation on how esper abilities work.

Angel Fall Arc

 * Main article:Angel Fall Arc

Due to Angel Fall, her appearance is given to an unknown truck driver who drives Touma back to the island to save his father.

Three Stories Arc

 * Main article:Three Stories Arc

In the anime adaptation, Aisa is seen walking by Julian Restaurant when she gets knocked down by an invisible Yamisaka Ouma who has kidnapped Index.

Kazakiri Hyouka Arc

 * Main article:Kazakiri Hyouka Arc

Aisa becomes the new transfer student of A Certain Highschool. She tells Touma on how she has heard of Kazakiri Hyouka while being in Kirigaoka Girls' Academy, that she is the key to the Imaginary Number Sectors and warns him to be careful of her. She is asked by Touma to join him with Index and Hyouka to go to the Underground Mall, but is disappointed that she is unable to, as she is asked to run an errand by Komoe.

Later, during Sherry Cromwell's attack on the mall, Aisa tries to call Touma on her phone, but is unable to get through to Touma properly. Interestingly, Komoe was able to get through Touma just fine. She and Komoe and later scold Touma in a certain hospital for his reckless behaviour.

Daihasei Festival Arc

 * Main article:Daihasei Festival Arc

Itsuwa and Aqua of the Back's Attack Arc
As Fukiyose Seiri and the 'three class idiots' talk about the upcoming cultural festival in Academy City, known as the largest culture festival in the world, Himegami is reading a book that states a good way to capture another person's heart is to stand out in some way, apparantly trying to gain Touma's attention and attraction. Komoe-Sensei then walks into the class, and Himegami despairs seeing no matter how much traits she has she can never match the numerous amounts of Komoe-Sensei (135cm height but still a grown women that chain-smokes and loves beer, specialises in studying pyrokinetic esper abilities, and a expert in AIM fields).

Poltergeist Arc

 * Main article:Poltergeist Arc

Aisa gets a cameo in episode 17 of the Toaru Kagaku no Railgun anime. Here, she is seen ordering all the hamburgers in the Macronall Hamburger. Tessou Tsuzuri, a member of Anti-Skill ask her why she wants all the hamburgers, with Aisa answering that she likes their taste. In this episode, it is indicated by Aisa's cross necklace that the Deep Blood Arc has already been concluded. Also, Aisa also states that she is from Kirigaoka Girls' Academy, which would imply that she has yet to enroll in a certain highschool.

In the final episode of the anime, she is seen with Komoe in the epilogue.

Abilities

 * Deep Blood (吸血殺し): Her blood attracts Vampires, drawing them in against their will mostly. Upon drinking it they automatically turn to ash. Deep Blood also allows her to see the internal flow of the blood vessels of every living creature, she can use this quality to pin point perfectly the source of injuries which helps her tremendously in treating them efficiently in a way that people without specialized equipment would normally find impossible. Her powers are later sealed by a Walking Church cross necklace as so she won't attract vampires.
 * Stun Baton: She has one and calls it her "wand."
 * First Aid: She has been trained in first aid.

Toaru Majutsu no Index-tan
Aisa is first seen in the special in a short parody of the opening theme, here she is seen holding the Palmtop Tiger from the [http://en.wikipedia.org/wiki/Toradora! Toradora!] series instead of Sphynx. Aisa is later seen with Komoe and Index-tan, in a parody to the scene in the Sisters Arc, where she enjoys the food Komoe cooked for them. Here, she asks Komoe repeatedly that she wants to eat meat, but is ignored by Komoe every time.

The 2nd Toaru Majutsu no Index-tan episode features Aisa in front of chalkboard, trying to say lines to the audience of is always cut-off before finishing a sentence, which may be a reference to her being insignifcant and ignored in the storyline. One notable line she would have recited was a line by Enma Ai, the main character of Jigoku Shoujo - while using the character's voice as well, who has the same voice actress (Mamiko Noto) as Aisa.

Trivia

 * Himegami first appear in the manga version in Volume 7 in Kazakiri Hyouka and the Imaginary Number Discrict Arc where she came in as a transfer student in A Certain Highschool like in the novel and anime version where Deep Blood Arc did not exist in the manga version and give warning to Touma about Kazakiri Hyouka.
 * After the events of the second novel, the ability scanner qualifies her as "level 0". Before having Deep Blood sealed the ability scanner ranked her at level 2, according to the novels.
 * She is the main character of a short story called "Deep Blood" in the Volume 2 of the manga, where she has to fight against "zombies" using her "Miko Powers". In a very Aisa like fashion, the story end ups with the Editor of the manga calling Kogino Chuuya, ordering him to cut Himegami Aisa's Deep Blood arc, in order to start right away with the Mikoto centric Sisters arc.

Quotes

 * (To Touma) "Lend me 100 yen since I'm beautiful."
 * "Perhaps, that is his fate. He raises flags with other people and goes down their story routes." -referring to Touma and his ability to attract girls.
 * (To Touma) "I'm a girl who goes unnoticed after all, huh?"
 * (To Tsuzuri) "Their taste is unforgettable. So I want them all." -referring to hamburgers.