Toaru Kagaku no Railgun T Episode 15

Promise (やくそく) is the 15th episode of Toaru Kagaku no Railgun T. It was broadcast on May 22nd 2020.

Kouzaku, who had undergone ability development at Clone Dolly, was asked to look after Dolly, who was also in the same facility for similar treatment. One day, Kouzaku's suspicions on Dolly's life support systems led her to discover the truth behind the girl's "treatment". Dolly, an artificially-produced clone, had her life shortened because of her exposure to experiments. Kouzaku's demands to stop the experiment were futile, and soon she was separated from Dolly.

Fueled by deep rage and hatred against Academy City, she fought, swearing to take revenge, but her plan that she struggled to put into fruition once again ended in failure. What awaits ahead of her is an encounter with another girl related to Dolly, "Misaki-chan".

Major Events

 * Kouzaku Mitori's past as a test subject and Dolly's first friend was revealed.
 * Mitori, Dolly and Misaki had a tearful reunion after discovering the location of Dolly's surviving clone.
 * The Judgment 177 Branch Office celebrated Kuroko's full recovery.
 * Misaka 10032 continued her full recovery at Heaven Canceller's Hospital.

Characters

 * Kouzaku Mitori
 * Dolly
 * Shokuhou Misaki
 * Aleister Crowley (indirectly referenced)
 * Kihara Gensei (flashback)
 * Shirai Kuroko
 * Misaka Mikoto
 * Uiharu Kazari
 * Saten Ruiko
 * Konori Mii
 * Misaka Misuzu (flashback)
 * Misaka 10032

Abilities

 * Liquid Shadow - Kouzaku Mitori, Level 4
 * Electromaster (Railgun-variant) - Misaka Mikoto, Level 5 (flashback only)
 * Mental Out - Shokuhou Misaki, Level 5

Locations

 * Academy City
 * School District 2 (flashback)
 * Exterior (flashback)
 * School District 7
 * Windowless Building (flashback)
 * Judgment 177 Branch Office
 * Heaven Canceller's Hospital

Trivia

 * The unnamed researchers are voiced by Shiomi Souma, Torigoe Maaya, and Yamamoto Shōta.

Referbacks

 * The scene of Mitori kidnapping Uiharu and Mikoto's mother from  is used as flashback when Mikoto thinks if her friends remember that incident.
 * Just like the, the scene of Mikoto telling the Shokuhou Misaki's Clique members to move from  is used as flashback when she again remembers the alteration of memories of her friends on her participation in the second day of Daihaseisai.
 * Scenes of Dolly and Misaki from  is used as flashback, thinking of memories with Dolly after seeing her again in her new body.

Cultural References

 * , also known as northern lights (aurora borealis) or southern lights (aurora australis), are lights created when charged particles from the solar wind emitted by the sun hit the magnetic field of the earth and interact to emit light. The best place in Finland to see the Northern Lights is Lapland above the Arctic Circle.
 * is a state of the United States of America located in Pacific Ocean. The dolphins can be seen in several places in Hawaii.
 * is fifteenth century Inca citadel, located in Peru, on a mountain ridge. The llamas can be seen in Machu Picchu as well.

Differences in Adaptation

 * In the episode, food packs were given to Mitori after she gets locked up, but originally, there are none in the manga.
 * Mitori's attack at the Windowless Building is anime-original, as the manga just skips it, meaning the readers has no idea on how she attacked the building.
 * The scene in Judgment 177 Branch Office in the second half of the episode, where Mikoto and friends celebrate Kuroko's recovery from her injuries is anime-original.
 * The scene in the car with Misaki and Mitori on their way to retrieve Dolly's new body is anime-original.
 * Dolly's reunion with Mitori at the start has added some small details, such as Mitori pinching Dolly's nose and the latter stretching her cheeks like before, as well as Dolly clutching her stomach as the scars were there, to ensure a much more impactful reunion. The same reunion scene in the manga does not have these small details.

Animation Trivia

 * Just like the, this episode starts with the OP before the episode proper, which is unusual for Railgun and by extension, Index anime adaptations.
 * The scene of Mitori and Misaki from  is reused in this episode, albeit extended.