Yomikawa Aiho

Yomikawa Aiho (黄泉川 愛穂) is a P.E. teacher at A Certain High School, and are good friends with fellow teacher, Tsukuyomi Komoe. Also a member of Anti-Skill, she cares for the well-being of children even if they are criminals, and absolutely believes that she will not use a weapon on children.

She is the current legal guardian of Accelerator, Last Order, and Misaka Worst.

Appearance
She is a tall woman that has glamorous proportions, and is always seen with a green jersey, which hugs tightly on her large bust. Her long hair is tied into a ponytail, making her look careless, but also gives her an intriguing sexy feeling.

Personality
She has a kind and caring nature, that extends to her job as Anti-Skill, and is most especially apparent with children, which she has promised to herself never to turn a weapon on them. However, her love more or less encompasses violence that an old generation P.E. teacher like her will execute.

She takes her job seriously, and often berates her junior, Tessou Tsuzuri if she doesn't do her job properly on patrols. Due to her habit of ramming delinquents with protective items like shield or helmets to resolve incidents, saying it's alright to do so since those are protective items, she's known as 'the woman who uses comedy-like methods to solve problems that could end up as a tragedy'.

Out of the job, she is very cheerful, and enjoys beer, eatouts, and public baths with her friends, apparently, willing to go become pass-out drunk in public. She also enjoys teasing Tsukuyomi Komoe as if she was a child. She also believes that there is no shame in showing her naked body to teenagers like Accelerator since they are still children. She also has a tendency of going on a cleaning spree when upset which ends up in making her do reckless things like losing her keys.

She has a tendency to end her sentences with "-jan" as a verbal tic.

Background
Not much known about her past, but it has been shown that she is good friends with Yoshikawa Kikyou, to the point that she can ask Aiho to take care of two children for her, as well as take her in. It is implied that Aiho has done something terrible for her to warrant not to use a weapon at a child even if they were espers, but it is unknown what had happened.

At some point before the series began, Aiho and her team dismantled the Special Ability Institute, the place where Accelerator was in until he was nine. Yomikawa Aiho lives in Family Side and is a teacher in A Certain High School, where she teaches a class full of elites, which is just next door to Komoe's class.

Kazakiri Hyouka Arc

 * Main article:Kazakiri Hyouka Arc

She is first seen telling Touma to keep safe while he withdraws his money. She is later formally introduced as a teacher in A Certain High School, talking to Tsukuyomi Komoe about Kamijou Touma's secret meeting with outsiders (Index and Kazakiri Hyouka), and later asks Komoe to confirm if there were actually two outsiders. She later leaves as she receives a call to capture an intruder in Academy City, Sherry Cromwell.

She reappears doing battle with Sherry's golem, to which their meager weapons cannot hold a candle to it. They are later decimated by a grenade that accidentally exploded near them, though injured, they all survived. As she comes to, she discovers Touma approaching, and knows that he is one Komoe's students, she and some of her group try to stop him, but she is too injured to do anything. In the orginal novel, the battle continues for longer, to the point where Hyouka appears wondering about Touma, as she is hit by a deflected bullet that utterly blows off half of her face. This event leads to her discovering that she is not human.

Later, after Touma discovers that he alone is not enough to beat the golem inside the Underground Mall and save Hyouka, she asks Aiho and the Anti-Skill help him save his friend. With that, they follow his plan. After Touma destroys the golem in order to save Hyouka. Sherry creates another one, at which point, Aiho protects Touma and Hyouka from any bullets and debris that might hit them. She orders her unit to fire at the golem in full force, to prevent Sherry from making any dangerous movements, lest she gets hits by the bullets. The battle draws out, Aiho asks Touma if he is going to continue with his plan, telling him that nobody will blame him if he chickens out. However, Touma is determined in going through with his plan. Aiho then orders the stopping in firing to allow to charge forward. Here, Aiho, though nervous of the great danger Touma puts himself through, and with some trouble, sees that he actually pulls through his plan. She once again tells her unit to fire, trapping Touma and Sherry behind the golem. Without anywhere to go, Touma successfully punches Sherry, stopping the golem. Sherry later gets away by going further underground with her magic.

Touma later demands Aiho to remove the barriers preventing their escape from the Underground Mall, as Sherry has turned her eyes Index, however, Aiho says that it is beyond their power. Touma is later taken into Anti-Skill custody during the end of the arc for all the trouble he caused them, which is assumed to be Aiho's group.

Tree Diagram Remnant Arc

 * Main article:Tree Diagram Remnant Arc

She is briefly seen guarding the bathroom that Accelerator and Last Order are using to bathing in, complaining about Kikyou giving her such a job, as she recuperates from her run-in with Amai Ao.

She and her unit is later tasked to attack the Science Association that is outside of Academy City, who has tasked Musujime Awaki to retrieve the Remnant of Tree Diagram. Awaki hears the battle ensue right after overcoming Shirai Kuroko,and falls into despair after they are overwhelmed.

Daihasei Festival Arc

 * Main article:Daihasei Festival Arc

As a member of Anti-Skill, she is to keep the peace while the festivities go on. She meets Touma and Index when she blocks their way from crossing the street. She tells them that they would have to take the long route in order to get across, much to Index's dismay.

She later accompanies Tsukuyomi Komoe during lunch time.

Academy City Invasion Arc

 * Main article:Academy City Invasion Arc

Before the start of the invasion, Aiho is first referenced by Kikyou to Accelerator and Last Order as the one who will be taking care of them from now on. Aiho is first seen talking to Komoe about her preference: alcohol or tobacco. Komoe, however, states that alcohol is prohibitted during work, to which Aiho decides that they should smoke. After discussing the state of Academy City's economy, Aiho then invites Komoe to join her into meeting the new students of the school. Accelerator and Last Order later arrives at A Certain High School, to which he and Last Order are introduced to Komoe. Accelerator then expresses his shock at Komoe's petite figure, then assumes that she is part of an experiment that involves stopping cellular aging. Komoe protests at his idea of her as a guinea pig, and soon, Aiho invites them to her car to take them to her apartment. There, Accelerator wants to confirm if Aiho is determined to take them into custody, considering his contact with the dark side of Academy City. Aiho proudly tells him that her job will keep her safe at best. Accelerator continues to point out the risks of taking him in, but Aiho smiles and instead, pertains what he has been blurting out as his declaration that he will protect them, much to the Level 5's annoyance.

As they arrive at her aparment, Aiho reassures Accelerator of their safety from any potential attacks. Aiho later argues with Kikyou in regards with her habits, as they leave Accelerator and Last Order to their own devices. She, Kikyou, and Last Order, later take a bath together, and as they get out of the bathroom, Accelerator enters, much to Last Order's surprise. Aiho and Kikyou takes this event cooly, apologizing for not locking as she has been living alone for so long. Last Order asks why they are not causing an uproar, to which Aiho says that it's because Accelerator is just a kid while they are adults. Aiho and Kikyou later punish Last Order for insinuating they were old women. Afte Accelerator realizes that Last Order is missing, and discovers that she went out despite the apparent danger of her going out, she and Yoshikawa prevent him from destroying her phone. Aiho later suggests that she will help Accelerator with searching for Last Order using Anti-Skill technology, as finding lost children is still part of her duty.

Accelerator manages to track down Last Order's last known location, thanks to Aiho's help. As they talk by phone, Aiho decides to ask Accelerator an important question: "Is showing goodwill to others really that scary?" Accelerator does not seem to understand what Aiho tries to point out at first, but soon, Aiho clarifies things; she thinks that Accelerator is still fearful of returning his goodwill he receives from Last Order. Aiho then recalls on his past, as part of the experiments of the Special Ability Holders Multiple Alteration Technologies Research Institute. He has accepted that fact that he was a monster since his days in the said facility, and because of this, he thinks that he is no longer able to show goodwill to people. Nonetheless, Aiho believes that Accelerator will have the potential of helping others through his powers. Accelerator momentarily thinks of what should have happened when he had used his ability to stop the experiment, but he does not have the courage to think aloud.

During Vento of the Front's invasion, Aiho begins to wonder why there are no cars in the streets. In her car, she receives a photograph of Vento of the Front, and requests details from headquarters but could not get any. After taking a look at the photograph of Vento of the Front, she collapses due to the effects of Vento of the Front's Divine Punishment. She is later found by Kikyou who is unsuccessful in waking her up. After Touma defeats Vento of the Front, Aiho was eventually freed from the "Divine Punishment's" curse.

Skill-Out Uprising

 * Main article:Skill-Out Uprising

In the aftermath of the invasion, she states that Accelerator "left her home", however unbeknownst to her, this was so because Accelerator was forced to join GROUP. She is first seen talking to Komoe about Nagatenjouki Academy trying to implement the Power Curriculum Program on a cat, and later talks about Komoe's runaway girls. Their conversation ends as Komoe hears a ruckus in her class. Her duties as an Anti-Skill have increased due to the need to increase security for the impending war. However, she also states that while they have increased security at Academy City's borders, this has also caused the Skill-Out to become more ambitious in their own goals.

During the Index II finale, she is seen having a conversation with Kikyou and Komoe, complaining that she was requested for additional work as a representative of Anti-Skill.

Document of Constantine Arc

 * Main article:Document of Constantine Arc

Aiho was forced to perform a power suit demonstration for investors, the Interceptor Show, in School District 3 at the start of the arc. Aiho noted how it was terribly uncomfortable to pilot a power suit while wearing an Anti-Skill bullet-proof armor vest to which the scientist monitoring the suit's operation answered that Yomikawa could have perfectly choose to pilot the suit wearing a bikini if she so desired. She later sees news on the recent anti-Academy City sentimets that are happening all around in Europe. She and the researcher later discuss the true nature of the of the exhibition, and shows anxiety regarding the recent events.

Battle Royale Arc

 * Main article:Battle Royale Arc

She is first seen conversing with Hamazura Shiage who was just about to break into a car, and becomes of suspicious of him as he was near a particle engineering lab that was being demolished by ITEM during their fight with SCHOOL. Shiage later tricks Aiho that there is a baby trapped in the car he was about to steal, which made the car's alarm sound off as she tries to open it. As Shiage goes into the car with a hasty Mugino Shizuri and Takitsubo Rikou, Aiho yells out to him what the car he is driving all about, to which Shiage replies that he just got his license.

After the Shiage and Rikou's falling out with ITEM, Aiho meets up with them, where Shiage gives an unconscious Rikou to her. Shiage hastily explains that she has been using Body Clear, which is slowly killing her. At that moment, a bloodied Shizuri appears before them, carrying the upper half of Frenda's corpse, whom she killed for her betrayal. Shiage pleads to Aiho to leave with Rikou as she has no way to take on Shizuri, the 4th ranked Level 5. Aiho hesitates for a moment, but acquiesces and tells Shiage not to die, as she will bring a fully armed Anti-Skill team once she gets Rikou safe. After Shiage defeats Shizuri, he later calls Aiho to inform her that the Anit-Skill is no longer needed.

She is reunited with Accelerator after she witnesses him defeating Kakine for the first time; she manages to convince Accelerator to let go of the gun and spare Kakine Teitoku, but she is stabbed by Dark Matter which infuriates Accelerator. Aiho's body is stepped on by Teitoku, to make fun of Accelerator, which pushes him to the edge. Luckily, Aiho was able to survive, and tries to stop Accelerator after she comes to. However, she is stopped by Saigou Ryouta, who tells a great distortion is taking place with regards to the AIM Dispersion Fields. She breaks from Ryouta's grasp, only to discover several armored Anti-Skills and armored vehichles. Aiho demands them to put their guns down, and tells that it is their duty to protect Accelerator. Aiho tries to come close to Accelerator, though because she is injured, blood spurts from her mouth, and is restrained by Ryouta. Aiho later witnesses Last Order approaching Accelerator, however, Anti-Skill begins firing on him without permission. However, despite this, Last Order is able to stave off Accelerator's wrath, and he calms down.

DRAGON Arc

 * Main article:DRAGON Arc

Accelerator broke into her apartment and took Last Order away with him and left her a note. Afterwards, Accelerator broke his only link to her as well as any other people in his life by destroying his phone. Here, she discovers a note from Accelerator, promising that he will definitely save Last Order.

Freshmen Arc

 * Main article:Freshmen Arc

In New Testament, when Accelerator came back, it was said that she punched him and then hugged him. She also tried to stop an argument between Last Order and Kikyou over a breast enlarging device, but somehow ended up getting involved herself.

Toaru Kagaku no Railgun
She does not appear in the original Toaru Kagaku no Railgun manga, but her role is expanded upon and replaces several unnamed characters in the anime adaptation.

Level Upper Arc

 * Main article:Level Upper Arc

She is retconned into the arc in the Toaru Kagaku no Railgun anime. Here, she first appears alongside her partner, Tessou Tsuzuri after Okahara Ryouta's attempted bank robbery, taking them into custody. She later appears prominently after Kiyama Harumi is discovered to be the master mind of the Level Upper. She along with Tsuzuri, are part of the team to capture Harumi and retrieve Uiharu Kazari (after being kidnapped by Harumi). They later engage a battle against Harumi, using Multi-Skill, a side-effect of the Level Upper Network, and is completely overwhelmed by her. She later aids Misaka Mikoto and Uiharu Kazari in their plan to stop the AIM Burst that have appeared after Mikoto defeated Harumi. Aiho and the others later take Harumi into custody after the incident.

She reappears later during the special class for the Level Upper users as the P.E. teacher. Here, she has them run around a track, and tells them to go beyond the limits of their abilities. She forces Saten Ruiko to keep on running even after she raised her hand that she couldn't do it anymore. She later takes Elder Sister down, who attacks her, after complaining about their treatment. She then uses Koujun Kikuhiko as an example of someone who doesn't give up despite raising his hand that he couldn't run anymore. Due to rain, she tells them to go back inside. She later appears with Tsukuyomi Komoe after her lecture regarding Personal Reality for their System Scan.

Poltergeist Arc

 * Main article:Poltergeist Arc

She first appears in the arc as being partner's with Tessou Tsuzuri on patrol. She saves Tsuzuri from a thug with one of her famous "comedy-like methods to solve problems that could end up as a tragedy." She berates Tsuzuri for her performance, and later tells her to make it up for it by telling, Misaka Mikoto, Shirai Kuroko, Uiharu Kazari, and Saten Ruiko to go home because curfew is near. She later slaps Tsuzuri at the back of the head for getting led on by the kids, and tells the group to go home, as well as the taciturn Kounoe Haruki. She later goes to a public bath with Tsuzuri and Komoe, and lectures the former again about her performance. They later go out to eat, to which a drunken Aiho tells Tsuzuri to make an impact. The next day, Aiho tells Tsuzuri's duties for the day, which goes awfully. During their bath together again, Aiho begins to notice Tsuzuri's depressed state, and as they eat out again, a tipsy Aiho asks her what's wrong, and tells her to do what she likes doing in order to relax. Aiho is forced to go on patrol the next day, as Tessou has failed to keep up with her work as a teacher. Aiho later becomes too drunk, and is later carried by Tsuzuri home. Aiho, the next day, doesn't get a hang over, and with Tsuzuri. She is later surpised by her enthusiasm. Aiho later calls Tsuzuri, worried about her, and tells her to come to their usual eating spot to treat her and Komoe. She is later present with Tsuzuri when Ruiko and Kazari tells her that Haruki has moved to a videogame development school, and notices her joy. With that, Aiho reminds the girls to go home before curfew, and is surprised by Tsuzuri's high spirits as they ready for another round of patrolling.

She and Tsuzuri are later chosen to guard Tokiwadai Middle School's Midsummer festival. She later chastizes Tsuzuri for eating too much from the buffet, and later guards her while listening to Mikoto's violin solo.

Finally, during the height of the RSPK Syndrome earthquakes, she is chosen as the presenter in the coalition meeting between Anti-Skill and Judgment. She later introduces guess speaker Therestina of MAR regarding the earthquakes. She reappears, dejected after MAR contacted them they need not worry about the Poltergeist earthquakes anymore, however, she becomes suspicious because MAR will not reveal any details. She is later called by Judgment 177 Branch Office, regarding the true nature of the MAR and Therestina, to which Aiho replies that they can do little because they have limits as well. It is not until Ruiko talks to her, that acquiesces to their demands. As Therestina chases Kiyama Harumi, Misaka Mikoto, Uiharu Kazari, and Saten Ruiko, in Harumi's car, she and her Anti-Skill unit distract and bother an MAR unit, foiling Therestina's plans on having the car intercepted by them. After the end of the arc, she and Tsuzuri look up to the sky to look at the blimp that contained Harumi's student's message to her.

Toaru Majutsu no Index Light Novel Volume SS2

 * Main article:Toaru Majutsu no Index Light Novel Volume SS2

Third Friday of January of the current year of the timeline.

Aiho is present during the car chase with Hamazura Shiage, Hattori Hanzou, and Komaba Ritoku, after they steal an entire ATM machine. She jumps out of the way just before the car they were driving hits an Anti-Skill barricade, making Aiho interested. She gives chase to them using an armored truck. After it gains speed with it, Aiho introduces herself to them as a member of Anti-Skill, and that she is taking them down. Hanzo tries to shoot her, but Aiho smashes the truck on their car, making it lose control. In the warehouse, Aiho is forced to contend against the three using handguns, and is later forced to run away because of the presence of fireworks, as Shiage shoots at the truck's fuel tank. Because of their recklessness, fireworks light off in the warehouse for Fukuoka Fireworks Manufacturing products. Aiho later returns to arrest them and throw them into a cell, where they complain about Aiho's brutishness, they are later surprised by Hanzou's declaring that he has fallen in love with her.

Toaru Majutsu no Index: Love Letter Competition

 * Main article: Toaru Majutsu no Index: Love Letter Competition 

Aiho is with Komoe after Fukiyose Seiri charged the latter with giving Touma the Kumokawa Seria's "love letter" to him. Aiho makes fun of Komoe for not being able to drink, and then notes on how Komoe seems not want to deliver the letter. When the wind blows the letter away, Aiho and Komoe try to go after it, but loses it as it comes near Misaka Mikoto who has been eavesdropping on their conversation.

Toaru Majutsu no Index-tan
Aiho only appears in the fourth episode of the shorts. Here, she accompanies Komoe, then suddenly hears a ruckus coming from her class, which shocks Komoe. After entering, the students ask what kind of bra she wears, back or front. Komoe replies that she doesn't wear one because she wears a training bra. As Komoe assesses the situation inside, Aiho remarks that she is somewhat jealous of Komoe's class, who is able to enjoy things without any worries.

Toaru Kagaku no Railgun MMR: Much More Railgun
Aiho appears in the first episode with Tsuzuri and Komoe, eating a deluxe dinner set. Aiho tells Tsuzuri that she is not allowed to eat meat since she causes a lot of trouble. Komoe notes that Aiho likes to use "jan" for some reason. To which Aiho references several things that sound like jan, from Jean Claude Van Damme to Jean Valjean of Les Miserables.

Abilities
As a member of Anti-Skill, she is trained in basic combat training, being able to take down thugs unarmed, as well as capable of using various firearms. She also knows how to operate Powered Suits. However, her greatest attribute is her ability to use"comedy-like methods to solve problems that could end up as a tragedy," using shields or other non-weapon objects to take down rampaging espers.

Design evolution
Aiho's design has remained static throughout all her appearances in the series. Just like Sherry Cromwell, Haimura designed her differently than the standard moe character fare.

Quotes

 * (To Accelerator in Index II Episode 17) "Just listen to yourself. Despite all you're saying, you're trying to point out the risks your guardian is taking. That means you are ready to protect us."
 * (To Accelerator in Index II Episode 18) "This is a rule I made for myself: I will never point a weapon at a child. Even if they're an esper. Do you know why?... That's exactly it. It's probably nothing compared to what you have to face. But the fact that we're heavily indebted to others is the same. So no matter how painful it is, there's no choice but to pay back as much as possible. And unlike me, if you have strength. There are many doors open to you."
 * (To Elder Sister in Railgun Episode 14) "How about surpassing your limits? Look at that guy. He was the first to raise his hand, but he's still running. The instant you say you're done and give up, it's over. You might have power in you that you aren't aware of yet. And her. She thought she was done too, but she ran another lap. Where did the power to run that lap come from? It's the same with ability development. If you decide your own limits yourself, it's over."
 * (To Accelerator in Index Volume 15) "It doesn’t matter whether you are a Villain or Hero, Accelerator, nor is what kind of world that you are involved in. For me, what’s most important is bringing you back. No matter how dark or cold your world is, I’ll never give you up, and drag you back!"
 * (To Anti-Skills regarding Accelerator in Index Volume 15) "'Do you know who it is standing there?! That is a child that we must protect! Pointing guns at children, I’ll never agree! How could I possibly agree to something like this!!” -- Said in Vol15 to prevent Anti-Skills attacking Accelerator.
 * (To Hamazura Shiage, Komaba Ritoku, and Hattori Hanzou in Index Volume SS2) "U-umm.. This is Yomikawa Aiho of Anti-Skill Branch 73. With charges of theft, property damage, attempted murder, and interference with a public servant's duties, I'm taking you pieces of shit down to Hell!!"