Toaru Kagaku no Railgun Manga Chapter 070

The 70th chapter of the Toaru Kagaku no Railgun manga was released on April 26, 2014. The chapter reveals the secret history of Kouzaku Mitori, her friendship with Dolly, and her eventual start of darkness.

By the release of the 10th volume of the Toaru Kagaku no Railgun manga, the contents of chapter 70 are later moved to the 68th chapter in the tankobon.

Synopsis
Kouzaku Mitori is a good girl, because she pretended to smile for the researchers to get on their good side. One day, she was asked to play with Dolly, who has taken a liking to her immediately, calling her "Mi-chan". Although she thought she was stupid, only with her did Mitori smiled genuinely unlike with the researchers. As she begins visiting Dolly everyday, she becomes suspicious with her situation. Mitori asks Dolly why she can't go outside, to which she confides to Mitori that she is being healed, so that she can help her little sister, which she has never met. She then says that if they can heal her then she can have many little sisters.

One fateful day Mitori came in as a check-up on Dolly was being conducted, and was shocked to see the life-support machines that were embedded into her body to keep her alive. She is then told to leave the room by a researcher, who explains Dolly's situation with her. Suspicious of this, Mitori began to investigate using her Liquid Shadow ability. Here, she discovers that Dolly is a prototype clone, where she is researched to get more data in creating more long lasting clones. She finds out that the researchers have been neglecting her health and was just giving her drugs to gather data, shortening her already short lifespan. Mitori confronts a researcher regarding this, threatens to go public with the information she gathered if they do not stop the medication on Dolly. The researcher refuses and tells her that the experiment was requested by the Board of Directors, pointing towards the Windowless Building. Mitori is then beaten up by two geared men, and put alone in a room. Her life spared because her latent ability being useful for Exterior.

Mitori later finds herself alone in the building, everything left to abandon. She returns to the floor where she was shown the Windowless Building, swearing revenge. In spite her efforts, she discovered that the Chairman of the Board of Directors is untouchable.

The fact cannot be taken away from Mitori, because she tried and was caught for her terroristic actions and sent to the Reformatory. Some time later, she was secretly removed from the Reformatory by some special forces geared men to bring her to Kihara Gensei. There, he enticed her with the prospect of being able to gain the necessary power needed to annihilate Academy City. After explaining to her his plan, Mitori asks why she was chosen, to which Gensei points out that it was because of her hatred. From then on, she works for Kihara Gensei.

In present time, Mitori wakes up after being defeated by Kuroko. Utterly beaten, she finds no reason in escaping her handcuffs with her powers. She is later visited by Misaki, and tells her that there is a clone, Dolly's younger sister, that has been transferred with the memories and experiences of Dolly. She tells her that though she isn't Dolly, she just can't let her be, and tells her to come with her. Mitori escapes her bonds and asks why she didn't just use her powers on her instead of explaining things to her. Misaki asks if she needed to use her power, to which Mitori says she didn't. Thus with a mutual understanding, Mitori stands once more to bring an end to the tragedy that has befallen on Dolly.

Major events

 * Misaki reveals to Mitori that Dolly has a Sister in which all her memories and experiences have been transferred to.

Characters
In order of appearance:
 * Kouzaku Mitori
 * Dolly (flashback-only)
 * Kihara Gensei (flashback-only)
 * Shokuhou Misaki

New Characters
No new characters were introduced during this chapter.

Abilities

 * Liquid Shadow - Kouzaku Mitori (young), Level unknown (flashback-only)
 * Radio Noise (Electromaster) - Sisters (referenced-only)

New Abilities
No new abilities were introduced in this chapter.

Locations

 * Academy City
 * Windowless Building
 * Reformatory (referenced-only)

Trivia

 * Parameter List is referenced for the first time in a medium that is not the light novels.

Referbacks

 * Misaki is shown passing by the building just before Mitori discovers Dolly naked.

Tankobon version
The tankobon version of 70th chapter of the Toaru Kagaku no Railgun manga was released on July 26, 2014. Titled as Promise (約束), it features the most prominent new content in the tankobon version. Chapter 70 is the last chapter found in the tankobon, and features the story of Misaki and Mitori liberating Dolly from her bondage.

Characters
In order of appearance:
 * Shokuhou Misaki
 * Kouzaku Mitori
 * Dolly

Locations

 * Academy City

Referbacks

 * Mitori wears a band-aid on her nose, a likely reference to the fact that Kuroko hit Mitori's nose during her fight in the sewers back in chapter 68 (magazine version) or chapter 66 (tankobon version).