Chapter Summaries

Mikoto took Kuroko, Chunibyo Shirai, and Saten to Higgins headquarters to show them its flying cars, while the episode offered a glimpse of Academy City's technology and its hidden history. Saten learned that Mikoto had founded Higgins, leaving the group stunned by the scale of her influence.

• Mikoto brought Kuroko, Chunibyo Shirai, and Saten to Higgins headquarters to try its flying cars.
• The group saw the unmanned headquarters and boarded a flying car, while Mikoto explained its security features and why the cars were not intended for general use.
• Chunibyo Shirai warned that people who had tried to attack Higgins had mysteriously disappeared.
• Saten asked who founded Higgins, and Mikoto revealed that she had established the company when she entered Academy City.
• Saten and Chunibyo Shirai were shocked by Mikoto's revelation, while Kuroko lamented that the distance between her and Mikoto had grown.

Mikoto learned that Index had arrived in Academy City earlier than expected, while the Magic Side investigated the city’s strange changes. The chapter ended with Shokuhou flustered after Mikoto misunderstood her teasing as a confession.

• Mikoto received word from the Imoutos that Index had entered Academy City, despite it being only May.
• Accelerator shared a meal with Touma and considered his Imagine Breaker and remarkable misfortune.
• Kuroko told Saten Ruiko that the captured intruders had lost their memories, while Shokuhou showed that she could not uncover what happened.
• Stiyl and Kamisato Kashiwazaki sensed that Academy City had changed after the world seemed to disappear on May 3rd.
• Shokuhou teased Mikoto about her boyfriend energy, and Mikoto asked if Shokuhou wanted to be her girlfriend, making Shokuhou blush.

Mikoto and Shokuhou began the Conjugate Plan to treat the aftereffects of their powers by synchronizing their AIM fields. Meanwhile, Short-haired Mikoto and Original Shokuhou watched the experiment unfold and panicked when Therestina suggested the pair sleep together to build understanding; the chapter ended with Shokuhou considering whether to leave a “seed” for Short-haired Mikoto too.

• Shokuhou told Mikoto that the research institute wanted them to try a treatment based on synchronizing their abilities, and the two went to the institute the next day.
• Therestina explained that the Conjugate Plan would help Mikoto and Shokuhou tune their AIM fields, then suggested they sleep together to cultivate mutual understanding.
• Short-haired Mikoto and Original Shokuhou jolted awake after watching Therestina’s suggestion and discussed asking for features that could censor or mute the experience.
• Mikoto woke in Dorm Room 208 in Shokuhou’s arms, and Shokuhou greeted her by calling her “my dear Railgun.”
• Mikoto and Shokuhou began the Conjugate Plan, which used Mental Out and Mikoto’s ability to connect with the Misaka Network and the Externalized Brain.
• Shokuhou said her AIM field and abilities had begun converging toward Mikoto’s, then wondered whether they should leave a “seed” for Short-haired Mikoto as well.

Mikoto and Shokuhou tested jointly controlling a robot as part of their rehabilitation research, while Therestina considered a disturbing experiment involving physically interlocking their bodies. The chapter ended with Original Shokuhou reacting in shock to a censored view of the pair washing up.

• Therestina said Mikoto and Shokuhou’s synchronization had improved and that they might regain normal mobility within Academy City in a month, then proposed having them control one body together.
• Mikoto and Shokuhou used VR-like devices to jointly control a robot, and their synchronization rate reached 78.4%.
• Therestina told Yoshikawa Kikyo she wondered what would happen if Mikoto and Shokuhou were physically divided and interlocked using Higgins’s technology, then separated after a year.
• Mikoto and Shokuhou finished the initial robotic tasks, received skintight suits, and went to wash up.
• Original Shokuhou reacted in shock to the censored view of Mikoto and Shokuhou in the bathroom.

Mikoto used Therestina’s body-control experiment to investigate her plan to merge and control Mikoto and Shokuhou, possibly turning herself into a Level 6. As Therestina noticed the experiment had not transferred their abilities, Mikoto decided to add new complications to the story.

• Mikoto took control of Shokuhou’s body and impressed the researchers with Shokuhou’s sudden athletic skills.
• Yoshikawa Kikyo questioned whether the experiment could harm the participants, while Therestina claimed Shokuhou might restrain the destructive effects of Mikoto becoming Level 6.
• Short-haired Mikoto and Original Shokuhou stopped watching the experiment and took a break after being overwhelmed by what they saw.
• Mikoto deduced that Therestina planned to contaminate their AIM fields, reshape their consciousness, and use their combined powers to become a Level 6.
• Therestina realized that exchanging control had not transferred their abilities and ended the experiment for the day.

Therestina’s treatment improved Shokuhou Misaki’s mental state, but Yoshikawa Kikyo discovered that Therestina planned to fuse Mikoto and Shokuhou into a controllable Level 6. Yoshikawa escaped the laboratory as Therestina began the plan early, while Mikoto and Shokuhou were summoned back for an examination and Saten’s meeting was postponed.

• Therestina explained that her experiment could combine Mikoto and Shokuhou’s abilities, and Shokuhou later said her mental state had improved.
• Mikoto considered sharing part of the Ruler of Domination’s seed with Shokuhou and reflected on the need to save the world again.
• Yoshikawa found files describing the Twin Project and realized Therestina intended to fuse the two Level 5s and connect a third person as their controller.
• Therestina confronted Yoshikawa, who triggered the alarm and escaped through a window as the shutters trapped Therestina inside.
• Therestina decided to activate her plan ahead of schedule, and Mikoto told Shokuhou that Dr. Lefrain had summoned them for an examination.
• Saten and Chunibyo Shirai learned that Mikoto could not meet them, then Chunibyo received a communication and said she had to leave too.

Saten Ruiko found the injured Yoshikawa Kikyo, who warned that Mikoto was walking into a trap, and Kuroko rushed to the institute. Therestina revealed her plan to become Level 6 and incapacitated Kuroko, but a Railgun blast suddenly tore through the institute wall toward her.

• Saten Ruiko took a shortcut through an alley and found Yoshikawa Kikyo unconscious and injured.
• Yoshikawa Kikyo warned Saten that the experiment was a trap and told her to warn Mikoto.
• Saten contacted Uiharu, and Chunibyo Shirai and Shirai Kuroko traced Yoshikawa Kikyo's route to the institute Mikoto and Shokuhou had entered.
• Therestina left Mikoto and Shokuhou waiting inside, then confronted Kuroko at the institute entrance.
• Therestina used strange music to disable Kuroko's teleportation and declared that she intended to become Level 6.
• A Railgun blast ripped through the institute wall and hurtled toward Therestina.

Mikoto and Shokuhou defeated Therestina after realizing her treatment plan was a trap and using a combination attack, then the story turned to the Conjugate Plan and the connection between Arisa Meigo and Shatiora Sequenceya. It left the origins of Arisa’s miracle and Shatiora’s wish under discussion.

• Uiharu realized Mikoto could be alerted through electromagnetic waves, and Chunibyo Shirai disrupted the laboratory’s electronic equipment through its network connection.
• Mikoto and Shokuhou used their combination attack to blast Therestina away, while Kuroko recovered and the robots were destroyed.
• Mikoto revealed that Therestina’s network connection had remained accessible through the power grid, and Judgment took Therestina into custody.
• Therestina realized Mikoto and Shokuhou had seen through her plan; they admitted they had treated it as a game and praised their finishing move.
• Original Shokuhou and Short-haired Mikoto watched the scene in stunned silence before Short-haired Mikoto asked how Shokuhou had controlled liquid.
• After Therestina was taken away, the Conjugate Plan brought up Arisa Meigo and Shatiora Sequenceya, whose connection came from a wish that created Arisa and saved a spacecraft’s passengers.

Mikoto went to find Kamijou Touma but encountered Arisa Meigo singing at the Astronomical Observation Festival. As Mikoto helped Arisa pack up, their shared connection to miracles created a warm resonance that drew them toward each other.

• Mikoto realized Arisa Meigo did not exist in her IF World because the original Arisa had sacrificed herself on September 20.
• Mikoto set out to visit Touma, but Arisa's song caught her attention.
• Arisa recognized Mikoto as the person who had rescued her from delinquents and introduced herself.
• Mikoto helped Arisa pack her musical equipment and promised that the universe would shine for her that night.
• Mikoto described Arisa's comforting aura, and the two felt an unexplained warmth and growing attraction between them.

Mikoto and Elisa grew closer during the Celestial Festival as they watched the stars from Elisa’s secret rooftop spot. The night ended with Elisa marveling at Academy City’s transformed sky.

• Elisa took Mikoto to a secluded rooftop where she practiced music, and Mikoto learned that Elisa cherished being Level 0 because it let her focus on music.
• Mikoto used her electromagnetic power to help carry Elisa’s instruments, and a drone delivered a picnic basket of sandwiches prepared by her Imouto.
• After sharing dinner on a blanket, Mikoto and Elisa watched Academy City’s lights go out for the Celestial Festival.
• Aleister’s observation made the Milky Way appear across the sky, and Elisa called Academy City wonderful.

Mikoto encouraged Elisa to see her life as more than music and made the night sky blaze with stars, inspiring Elisa to record the beauty of the world through her songs. In the dream world, Original Shokuhou teased Short-haired Mikoto about her closeness with Elisa, and they considered involving the Misaka Sisters to reach the other world before Mikoto objected.

• Mikoto told Elisa that her life had meaning and that meeting one another was a miracle.
• Mikoto filled the sky with countless stars and a brilliant Milky Way for Elisa.
• Elisa thanked Mikoto and realized that her songs could preserve the beauty of her life.
• Original Shokuhou called Short-haired Mikoto a two-timing flirt, and the two bickered over Mikoto's relationship with Elisa.
• Shokuhou explained that increasing the number of observers might help them reach the other world, then suggested involving the Misaka Sisters.
• Short-haired Mikoto refused to drag the sisters into the situation, and Shokuhou teased her about being replaced by another Mikoto.

Mikoto met Touma after he lost his groceries and shared food with him, while Original Shokuhou and Short-haired Mikoto watched their other selves across worlds. Meanwhile, Kamisato Kashiwazaki and Stiyl investigated Arisa Meigo’s possible status as a Saint, and Shokuhou Misaki ordered spies watching Mikoto removed.

• Kamisato Kashiwazaki and Stiyl received intelligence that Arisa Meigo might be the ninth Saint and decided to gather more information.
• After parting from Arisa Meigo, Mikoto ran into Touma, whose groceries had spilled and whose meat had been stolen by a stray cat.
• Mikoto offered Touma a sandwich and asked about his life in that world; he said things were mostly normal and credited everyone with helping save the world.
• Original Shokuhou and Short-haired Mikoto watched Mikoto and Touma address each other by their given names, leaving Short-haired Mikoto irritated and jealous.
• At Tokiwadai, Mitsuya Aiyu reported to Shokuhou Misaki that matters had been handled, and Shokuhou ordered anyone spying on Mikoto removed.

Kamijou Touma met an unfamiliar Index and took her in after she said she was hungry and fleeing pursuers. As Index explained her mission, Touma questioned what would happen if someone had created the world and that process had been interrupted.

• Kamijou Touma discovered Index on his balcony and hid his tears before offering her food.
• Index introduced herself and explained that she had come to Academy City because someone was chasing her for the 103,000 Grimoires in her head.
• Mikoto recognized Index and Touma’s meeting as the beginning of A Certain Magical Index and noted that there would be no memory loss this time.
• Touma asked Index whether someone who created the world would be the Lord, and what it would mean if the creation process had been interrupted.

Mikoto told Aleister she wanted to break the world from its predetermined course, and Aleister explained that Mikoto could become its administrator. Meanwhile, Touma and Index reenacted the destruction of the Mobile Church, and Index later encountered Mikoto and Shokuhou while searching for the Lord’s aura.

• Mikoto told Aleister that she wanted to make the world break away from its original trajectory, and Aleister said Mikoto might become the world’s administrator if its restraints were removed.
• Touma watched Index’s Mobile Church fall apart when he touched her clothes, then handed her his key and hurried off to class.
• Index left Touma’s home, leaving the key behind, but forgot her nun’s cap.
• Mikoto and Shokuhou discussed Academy City’s return to normal as Index appeared while searching for the Lord’s aura and looked at Mikoto with reverence.

Mikoto and Shokuhou met Index and invited her to eat, while Mikoto noticed Stiyl and Kamisato watching them. After Index hurried off to retrieve her nun’s cap, Mikoto went to deal with the men waiting along Index’s route.

• Index mistook Mikoto for a lord, but Mikoto introduced herself and Shokuhou and invited Index to join them.
• Mikoto gave Shokuhou a Gekota hair accessory, then took Index and Shokuhou to a burger joint while keeping an eye on Stiyl and Kamisato Kashiwazaki.
• Index ate a feast, then realized she had left her nun’s cap at Kamijou Touma’s home and hurried away to retrieve it.
• Mikoto left Shokuhou behind to handle matters as Stiyl and Kamisato prepared a spell to clear bystanders from Index’s route and attack her.

Mikoto confronted Stiyl and stopped Kamisato Kashiwazaki from attacking Index, then revealed the overwhelming power of her Electromagnetic Force against Stiyl’s magic. After Mikoto’s Lightning Giant smashed apart Witch Hunter King, the magical giant regenerated.

• Mikoto arrived and disarmed Kamisato Kashiwazaki with electricity, preventing her from attacking Index.
• Kamisato Kashiwazaki left to pursue Index while Stiyl stayed behind to fight Mikoto.
• Stiyl’s first Flame Sword went out against Mikoto, but his later fire attacks forced her to evade.
• Stiyl summoned Witch Hunter King, and Mikoto used Electromagnetic Force to create a giant of plasma that blocked its blade.
• Mikoto’s Lightning Giant smashed Witch Hunter King apart, but the magical giant regenerated.

Mikoto defeated Stiyl’s Witch Hunter King after explaining that her Lightning Giant sustained itself through fusion, while Short-haired Mikoto worked out how she might reproduce the technique. The story then shifted to Touma and Index at home before Kamisato Kashiwazaki faced Mikoto and resolved not to lose.

• Mikoto explained that the Lightning Giant used fusion and could keep fighting without running out of energy, prompting Short-haired Mikoto to consider recreating the process.
• Mikoto revealed that her Misakas had removed Stiyl’s talismans, allowing the Lightning Giant to crush the weakened Witch Hunter King.
• Touma found Index waiting at home, welcomed her inside, and began cooking while Index hid her farewell note.
• Mikoto intercepted Kamisato Kashiwazaki after defeating Stiyl, leaving Kamisato Kashiwazaki feeling unable to fight her.
• Kamisato Kashiwazaki refused to accept defeat and resolved not to lose to Mikoto.

Mikoto defeated Stiyl’s Lightning Giant and questioned Kamisato Kashiwazaki about the magicians’ mission to retrieve Index. After Mikoto challenged their belief that Index’s memories had to be erased each year, Kamisato began to fear that they had been killing Index instead of protecting her.

• Stiyl’s Flame Swords failed to harm the Lightning Giant, which crushed him with a stomp.
• Kamisato Kashiwazaki prepared to fight Mikoto but realized she had never announced her Magic Name and could not bring herself to do so.
• Kamisato told Mikoto that she and Stiyl were Anglican Church magicians seeking to protect Index and her 103,000 Grimoires.
• Kamisato explained that Index could retain only one year of memories and that the magicians erased them annually.
• Mikoto challenged the claim that Index’s brain required memory erasure, warning that physically removing synapses would be like killing Index.
• Kamisato’s worldview collapsed as she wondered whether she and Stiyl had been killing Index repeatedly.

Mikoto rescued Kamisato Kashiwazaki, reassured her that Index was safe, and reunited with Shokuhou Misaki. Later, Shokuhou dressed Mikoto in various outfits while Index grew too relaxed at Touma's home to leave; the chapter ended as Mikoto offered Shokuhou an outfit of her own.

• Mikoto told Kamisato Kashiwazaki that Stiyl Magnus had been sent to the hospital, introduced herself as Railgun, and left to meet Shokuhou Misaki.
• Mikoto shared her crepe with Shokuhou and explained that her Electromagnetic Force could burn away excess fat, exciting Original Shokuhou.
• Index returned to Touma's home, ate dinner, bathed, and went to bed before realizing she was supposed to leave, then decided to rest a little longer.
• Shokuhou continued dressing Mikoto in different outfits and decided that Mikoto looked best in a loose dress with bare legs.
• Mikoto told Shokuhou that she had an outfit she wanted to give her.

Mikoto gave Shokuhou a ring that summoned custom Domination Armor designed to support her Mental Out ability and suppress her allergy. The original Mikoto and Shokuhou woke from the dream in a panic, then heard a door open outside.

• Mikoto explained that she had combined the Ruler of Domination concept with Valkyrie Armor to make custom armor for Shokuhou.
• Shokuhou asked Mikoto to put the ring on her left ring finger, and the ring immediately eased her mind.
• Shokuhou froze the people in the mall while Mikoto disabled the surveillance cameras, and Shokuhou summoned the white Domination Armor.
• The original Mikoto and Shokuhou woke from the dream drenched in cold sweat after a guest room phone rang.
• Short-haired Mikoto and Original Shokuhou discussed upgrading the observation device before they heard a door open outside.