Dream Ranker Arc

Dream Ranker Arc (ドリームランカー編) is a story arc in the Toaru Kagaku no Railgun manga series. The story focuses on a series of events involving a group of people called Dream Rankers and the trend of sharing dreams using a specific kind of technology.

Dream Ranker Technology
A recent trend among the student population of Academy City involves a set of cards called Indian Poker and related technology that allows a person to capture one's dreams and store it in a card-like form for other people to use. The fad manages to seep through the School Garden of Academy City's District 7, allowing one of its students to acquire and share her own dreams with others, as well as learn mundane abilities like expertly playing kendama and twirling pens or more noteworthy ones like learning a new language or properly preparing chemicals with a desired effect.

Shared Dreams
During class, Misaka Mikoto and Shokuhou Misaki enter a typical short argument against each other. A third girl involved, who is a third-year member of Misaki's clique, feels responsible for causing the encounter between the two and meets with Mikoto later during the day. Here, as a peace offering, she hands a card to Mikoto. Mikoto does not know anything about the card she received, but her friend Saten Ruiko explains that it is part of a recent trend involving cards used to share dreams with other people. Curious about how the card works, Mikoto uses it that night and ends up in a fairytale land with several Gekota-like characters serving a queen who resembles Shokuhou Misaki herself. In her rage after being dressed as a maid and forced to serve Misaki, she snaps out of her dream.

Although Mikoto loses her interest in learning more about Dream Rankers, she catches wind of more details about them through Ruiko. She is later invited by the Ringlet curl girl to have some tea that afternoon, only to find out that it was the latter's plan to bring the two Level 5s of Tokiwadai closer. The three girls then overhear a conversation nearby involving a Dream Ranker who belongs to the highest rank, known to his patrons as BLAU. Although BLAU claims to share his dreams for free, the sheer amount of indecent content he propagates is enough for Mikoto and Misaki, after hearing that they have both ended up as one of his "targets", the two make a temporary truce in order to deal with him swiftly and destroy any Dream Ranker cards in the possession of BLAU and his companions.

Treasure Hunter App
Elsewhere, in the morning of September 27th, an accident was reported to the authorities. Among those who began an investigation about the event were Judgment's Uiharu Kazari and Shirai Kuroko. Both Kazari and Kuroko were informed about a particular mobile application which allows users to earn prizes by capturing images of designated areas of the city. The app also tags locations of accidents, whether it has happened before or will happen in the future. In addition to this, the app has a prediction window of twenty to forty minutes (ten to twenty minutes off the indicated time) and is known for its high rate of success.

Kuroko suspects that an esper that uses an ability similar to Precognition may be involved with the app and takes Kazari to head to a nearby roadside where an accident is predicted to happen. Just as foreseen, an accident involving a truck and a car occurred at the location. Kuroko, however, manages to save a student that was caught in the path of the accident. After confirming that there are no casualties, Kuroko heads to the nearest building with a vantage point of the area as she suspects that the one who made the predictions will be nearby to confirm them. There, she meets Miyama Shaei, an elementary school boy who claims to be the creator of the Treasure Hunter App.

Shaei talks to Kuroko and Kazari about his ability, which allows him to produce photographs with information about a future event with the use of an instant camera. According to Shaei, his images usually require further analysis through a research institution's equipment, but increasing his focus he can include the date and location of the incident and then analyze the photos with a smartphone app developed by a particular company for Thoughtography espers, the app now used to compile images of predictions made. As of the present, he is using the app not only to conceal his identity but also to look for someone who can overturn the predictions he made, something that he was unable to do alone. Kuroko is skeptical that the nature of her teleportation can counter Shaei's prediction ability, but later agrees to help after seeing his abilities firsthand.

With the help of Kuroko and Kazari, several of Shaei's predictions are intercepted with positive results. However, the drive to make even more results happen push him to the point where his body starts breaking down due to excessive use of his ability. Nonetheless, as Shaei is admitted to a hospital to recuperate, the Judgment duo continues to work with his predictions. Shaei makes enough progress in his recovery and frantically heads to a nearby park where one particular prediction that involves his dog friend Pero. Here, he was able to witness Kuroko rescue Pero from certain harm.

After Shaei makes a full recovery, he plans to stop using his ability. However, an optimistic Kuroko urges him to follow through the Power Curriculum Program to improve on his ability so that he can use it without causing harm to his body. Shaei also gives Pero to his former classmate Ookawachi Megumi to take care of for the meantime.

Quest for the Bust Upper
Although initially indifferent about the concept of Indian Poker cards, Mikoto eventually rekindles her interest about the cards when she heard about a certain card that can increase the bust size of anyone who uses it: the infamous Bust Upper. Meanwhile, Kinuhata Saiai is suffering from a looming feeling of jealousy over the breasts of her partners in ITEM (to the point that Frenda's breasts are bigger than hers) and this forces her to look for a way to make her bust size grow. This inevitably arranges a meeting between the two girls who want the Bust Upper for themselves. However, due to a mix-up caused by the man selling the Dream Ranker cards, the Bust Upper card is mixed among others that the man is selling. Eventually, Mikoto and Saiai each agree to buy half of all the cards sold by the man, and due to the nature of Indian Poker cards, they also agree to share the Bust Upper card with each other, provided that the card is found among the stockpile of cards in their profession.

In a nearby internet lounge, Saiai and Mikoto spend the time using Indian Poker cards and eventually find themselves in the dreams of various people. This includes a ninja in training (met twice), a researcher with a similar plight about bust size, a maid who has to endure her brother's perversions, a roadside artist who manages to talk to someone who takes pride in her figure, and a timid high school girl who laments about her C-cup breasts. The frustration caused by the breast-themed encounters cause both girls to lose their tempers to the point that they are evicted from the internet lounge. Mikoto and Saiai later continue their search in the poolside of a nearby resort, where a crow snatches a card from their stockpile, only to drop it on the bench of a random girl in a park after being spooked by a certain nun's cat. The next day, that girl appears with a bigger bust size than before.

Pursuit for the "Chopsticks"
Saten Ruiko is shopping at a grocery when she suddenly finds a blonde girl desperately looking for canned mackerel after she picked up the last two cans on sale. This girl, named Frenda Seivelun, ends up wasting a can after hastily opening the one she received from Ruiko, and Ruiko hesitantly decides to invite Frenda after seeing her reach the point of crying after the accident. At Ruiko's apartment, Frenda enjoys the mackerel curry prepared by Ruiko despite being a purist about eating mackerel and decides to become friends with her, registering her ID in the social networking service Speech Bubble. Frenda and Ruiko later use the SNS to talk with each other about random things.

Ruiko later goes to the peddler of Dream Ranker cards that she patronizes and she is quickly asked if she is interested about some of the cards on sale, including a card from a coin stacking record holder and "someone with amazing skill using chopsticks". Ruiko appears to purchase the "chopsticks" card, oblivious to the fact that her activities are tracked down by a girl in a dress and a boy wearing a peculiar head accessory, who identify the "chopsticks" mentioned in the Indian Poker card as the Tweezers, a device that can be used to handle microscopic objects. Ruiko is abducted by thugs shortly after the purchase, and Frenda, who still feels indebted to Ruiko after the hearty meal, decides to pursue the van that took Ruiko captive and retrieve her without hurting either the thugs or Ruiko herself.

As the boy with a head accessory extracts information about an Indian Poker card stored in a secure research facility, a girl from Private Shidarezakura Academy who follows the boy's orders heads to the thugs who have lost what the boy deemed as an important target. Here, the girl, named Yumiya Rakko, identifies the perpetrator of the ambush based on footprints on the ground. Meanwhile, Ruiko manages to survive the kidnapping, losing only her phone and the Indian Poker card she just bought, but Rakko successfully tracks down Frenda and uses an unknown device to snipe her from a distance in the middle of a bustling crowd.