Chapter Summaries

Li Yu learned that Pandora was preparing to match the Demon Gods’ power after absorbing the world, and she sent him to visit the world of A Certain Magical Index. He reached the sealed underwater facility beneath Boundary Island and found a laboratory hall containing a dimensional entrance and strange artifacts.

• Li Yu suspected Pandora had allied with Aleister and helped establish the supernatural abilities in this world, while Principal Hu said Pandora handled contact with the other world.
• Principal Hu assured Li Yu that supplies and freshwater would not be a problem when Boundary Island rose into the sky, and Li Yu agreed to help power its ascent.
• Li Yu told Da Vinci and the other Heroic Spirits that he had brought Betty’s library from Abant, and they rushed through the passage to explore it.
• Pandora told Li Yu she would soon become as strong as the Demon Gods after absorbing this world and instructed him to tell the upside-down man that she was nearly ready.
• Li Yu entered the underwater facility beneath Boundary Island, found a modern laboratory hall with a sealed dimensional entrance, and saw strange artifacts including an arm.

Li Yu entered the world of A Certain Magical Index and met Aleister, who asked him to teach Touma Kamijou a way to protect himself. Li Yu agreed, hoping the arrangement would also let him meet Index.

• Li Yu examined a mysterious arm in a glass case, then entered the world of A Certain Magical Index through the Dimensional Rift.
• Awaki Musujime met Li Yu in the Windowless Building and told him that Aleister wanted to see him, but Li Yu went directly to Aleister himself.
• Aleister and Aiwass discussed Li Yu's power, and Li Yu delivered Pandora's message that she would soon be able to deal with the Demon Gods.
• Li Yu explained that he had come to explore the world, and Aleister asked him to teach his friend Touma Kamijou how to protect himself.
• Li Yu agreed to teach Touma, partly because he hoped the arrangement would help him meet Index.

Li Yu settled into Academy City and was assigned to instruct Kamijou Touma in a sanctioned experiment. After discovering Touma’s Imagine Breaker and meeting him, Li Yu explained the arrangement, and Touma asked when the experiment would begin.

• Aleister gave Li Yu identity documents, money, and an apartment, then discussed his potential with Aiwass and suggested he meet Kamijou Touma.
• Li Yu explored Academy City, discovered that it had built Gundam-like mecha for space exploration, and copied their data.
• Li Yu moved into the apartment beside Touma’s and considered teaching him physical training techniques that Imagine Breaker could not erase.
• When Touma returned home, Li Yu passed through the wall, introduced himself as his neighbor and instructor, and showed him the experiment paperwork.
• Touma verified the experiment on Academy City’s website, received a delayed text confirming it, and asked Li Yu what he needed to do and when they would start.

Li Yu taught Kamijou Touma a breathing technique to improve his physical abilities and prepared a weakened Gourmet Cell serum for him. After three days of training, Li Yu returned to Touma to begin testing the serum.

• Li Yu taught Kamijou Touma a breathing technique and told him to practice at home for three days.
• Kamijou Touma felt strength fill his body after completing a breathing cycle and eagerly took leave from school to train.
• Aleister told Aiwass that Imagine Breaker had been traded to Pandora and that Touma becoming stronger would benefit them.
• Li Yu obtained Gourmet Cells from Nangong Natsuki and used a laboratory arranged by Aleister to make a serum that could raise physical abilities to Level 4, with Level 5 possible through training.
• Li Yu returned to Kamijou Touma after three days of practice and prepared to test the serum on him.

Li Yu gave Kamijou Touma a serum that strengthened his body, then brought him to Tokiwadai Middle School for testing. As the tests began, Li Yu noticed Shokuhou Misaki did not recognize Touma and planned to test Imagine Breaker himself later.

• Li Yu gave Kamijou Touma an enhancement serum, which caused intense heat and hunger as it strengthened him.
• Touma ate five servings of food, discovered his new strength when he slammed a door shut, and survived Li Yu throwing him from the fifth floor.
• Li Yu contacted Aleister, who directed him to take Touma to Tokiwadai Middle School for testing.
• Tokiwadai's principal welcomed Li Yu and arranged tests on the athletic field while Misaka Mikoto, Shokuhou Misaki, Shirai Kuroko, and Hokaze Junko watched.
• Li Yu saw that Shokuhou Misaki looked at Touma with unfamiliarity and planned to test Imagine Breaker himself.

Li Yu approached Shokuhou Misaki, demonstrated that her Mental Out could not affect him, and gave her knowledge and a breathing technique from another world. As Kamijou Touma’s tests reached Level 4, the researchers became excited by the enhancement medicine’s potential.

• Li Yu told Shokuhou Misaki that his medicine could improve her athletic ability and prevent weight gain, then demonstrated that he could repel her Mental Out.
• Li Yu connected to Shokuhou Misaki’s mind, read her thoughts, and told her that he came from another world.
• Li Yu gave Shokuhou Misaki information about other worlds and a breathing technique, which she immediately tried and found improved her physical condition.
• Li Yu told Shokuhou Misaki that he hoped she would become one of his girlfriends, while she doubted his explanation.
• Kamijou Touma’s tests reached Level 4, prompting the researchers to see the enhancement medicine as strategically valuable.

Kamijou Touma’s new strength drew the researchers’ attention, and Li Yu began training him in combat so he could control it. After Li Yu knocked him down and gave him martial techniques, Kamijou prepared to try again with the breathing method he had learned earlier.

• Kamijou Touma struck the strength-testing machine hard enough to reach the Level 4 standard, prompting researchers to take his blood and examine him.
• Shokuhou Misaki considered practicing Li Yu’s breathing technique to improve her physical fitness.
• Li Yu challenged Kamijou Touma to a hand-to-hand fight, and Kamijou agreed after Li Yu offered to pay for his meals if he could hurt him.
• Kamijou Touma charged Li Yu, who flicked him flying and then passed martial techniques directly into his mind.
• Li Yu threw Kamijou Touma down again, then reminded him to combine the techniques with the breathing method he had learned three days earlier.
• Kamijou Touma got up, regulated his breathing, and prepared to face Li Yu again.

Li Yu trained Kamijou Touma in martial arts, then had him fight Misaka Mikoto to test his ability. Touma erased her esper attacks and nearly struck her, leaving Kuroko asking how he had defeated her.

• Kamijou Touma practiced martial arts against Li Yu and began using the techniques Li Yu had taught him.
• Li Yu phased into a dimensional space, but Touma's punch dispelled the ability; Li Yu then challenged him to test his strength against Misaka Mikoto.
• Misaka Mikoto attacked Touma with electricity and iron sand, but he erased each supernatural attack and rushed into close range.
• Touma stopped his fist just before hitting Misaka Mikoto, and Li Yu explained to Kuroko that Touma was the natural nemesis of every esper.

Li Yu explained Kamijou Touma’s power to Kuroko and gave her his contact information, drawing Shokuhou Misaki’s interest as well. After Li Yu and Kamijou left Tokiwadai, Academy City’s dark side ambushed them, but Li Yu disabled the attackers before Kamijou could intervene.

• Li Yu told Kuroko that Kamijou’s right hand could erase supernatural abilities and that his speed made him difficult to counter.
• Kuroko asked about Li Yu’s ability, and he said it involved both space and time before giving her his contact information.
• Shokuhou Misaki recorded Li Yu’s contact information while controlling the nearby students, and Li Yu ended the test and left with Kamijou.
• Research institutions obtained Kamijou’s test results and sent Academy City’s dark side to abduct him.
• Li Yu warned Kamijou not to intervene, then shattered the attackers’ equipment and bones as they lay in ambush.

Li Yu rescued Index from the balcony of Kamijou Touma's dorm and explained that she was being hunted because of the knowledge in her mind and a collar that periodically erased her memories. He offered to examine her and remove the collar, while secretly redirecting Kanzaki Kaori and a delinquent boy toward Academy City's approaching dark-side members.

• Li Yu carried the unconscious Index inside and revived her with a bottle of Red Potion as Kamijou Touma learned that magic and other worlds were real.
• Index thanked Li Yu, then grew wary when he identified her as the Index Librorum Prohibitorum and revealed that she was being hunted and had lost her memories.
• Li Yu explained that the English Puritan Church had placed a collar on Index and erased her memories regularly, and he pointed out that a tracking spell might be helping her pursuers follow her.
• Index questioned whether Li Yu could use magic, and he demonstrated unfamiliar Magic Arrays before offering to examine her and remove the collar.
• Li Yu told Index that he came from another world, then secretly transferred Kanzaki Kaori and the delinquent boy toward the dark-side members approaching the dorm.

Li Yu restored Index’s memories, removed her collar, and copied her grimoire knowledge while improving her Automatic Library. He then learned from Aleister who had been watching Kamijou Touma and used spatial power to kill the people on Aleister’s list, triggering alarms across Academy City.

• Kanzaki Kaori and Stiyl Magnus were surrounded by armed operatives and began fighting them.
• Li Yu removed Index’s collar, restored her memories, copied her grimoire knowledge, and modified her Automatic Library, causing her to faint.
• Li Yu told Kamijou Touma that Index’s grimoires were his payment and confirmed Touma had been watched; he then sent Index to his room.
• Li Yu spoke with Aleister, who sent him a list of Kihara members and other people involved in the attack.
• Li Yu used spatial power to target everyone on the list, killing them and setting off alarms throughout Academy City.

Li Yu captured Mugino Shizuri and the other ITEM members after they tried to break into his laboratory, then began sorting through valuable research documents. As Misaka Mikoto and Kuroko planned to meet Li Yu the next day, Saten Ruiko anxiously awaited a chance to gain power, while Li Yu returned to find Index still asleep.

• Li Yu trapped Mugino Shizuri and the other ITEM members in a room at the laboratory, intending to use them for experiments.
• Mugino Shizuri accused the group’s mission of being a trap, while Takitsubo Rikou urged everyone to wait.
• Li Yu gathered research documents from laboratories linked to the Kihara faction as Academy City's network filled with news of the attacks.
• Misaka Mikoto told Kuroko they would meet Li Yu with Ruiko the next day, then electrocuted Kuroko after she jumped onto her.
• Saten Ruiko anxiously anticipated taking part in a way to gain power comparable to an esper’s.
• Li Yu returned to his dorm room and found Index still asleep.

Li Yu learned that Index had recovered her memories and agreed to take her to his world after she chose to leave the Anglican Church behind. After promising Kamijou Touma a future visit to his world, Li Yu took Index to his laboratory to handle a message from Kuroko.

• Li Yu told Kamijou Touma he could return to his own world at any time and agreed to take him there someday, but said he had to wait.
• Index woke with her memories restored, thanked Li Yu, and chose to go with him rather than contact Kanzaki Kaori and Stiyl Magnus.
• Li Yu agreed to take Index to his world after a few days and described the food-filled Gourmet World, which excited her.
• Index ate a large meal, then chose to accompany Li Yu when he received a message from Kuroko.
• Li Yu sent Kamijou Touma the key to his room and transferred himself and Index to his laboratory, where he remembered the imprisoned ITEM group.

Li Yu brought Index to see the imprisoned ITEM members, then taught Kuroko, Misaka Mikoto, Saten Ruiko, and Uiharu Kazari a breathing method to strengthen their bodies while the enhancement agent was unavailable. He promised that the method could also improve Ruiko and Uiharu’s esper abilities, leaving Ruiko eager to train.

• Li Yu showed Index the detained ITEM members, explained they had tried to steal something, and left them sealed in the research institute with food and water.
• Kuroko arrived with Ruiko, Uiharu, and Misaka Mikoto, and Li Yu led them into the otherwise empty institute.
• Kuroko said that she and Misaka also wanted to improve their bodies, so Li Yu began teaching all four a breathing method instead of giving them the unavailable enhancement agent.
• Li Yu told Ruiko that her esper ability could become powerful and promised that the breathing method might improve it, prompting her to resolve to train intensely.
• Index recognized that Li Yu’s method was incomplete, and Li Yu explained that he had omitted the swordsmanship portion because the girls did not need it.

Li Yu told Misaka Mikoto and the others about the coming connection between worlds, then tested whether Academy City’s espers could use magic from his world. As ITEM and Index tried his meditation method, Li Yu spotted Kanzaki Kaori and Stiyl Magnus searching his dorm for Index and sent them a message.

• Li Yu admitted to Misaka Mikoto and the others that he came from another world and explained that their worlds would eventually connect, urging them to practice his breathing method.
• Li Yu asked ITEM to test his world’s magic and gave the four members meditation manuals; Index also tried the method after realizing it might let her store magic power.
• Li Yu used Aerial Control to observe Academy City and found Kanzaki Kaori and Stiyl Magnus searching his dorm for Index.
• Li Yu wrote a message and transmitted it to Kanzaki Kaori and Stiyl Magnus.

Li Yu took Index and the ITEM members to experiment with a meditation method that could give them magical power, while Kanzaki Kaori and Stiyl Magnus learned that Index had been taken. As the ITEM members began meditating, Li Yu discovered their magic power seemed to develop attributes linked to their esper abilities and wondered whether Academy City's 2.3 million espers could learn magic.

• Kanzaki Kaori found Li Yu's message saying he had taken Index, and she and Stiyl Magnus rushed to report it to the Anglican Church.
• Index told Li Yu she had gained magical power through meditation, and he said he would take her to attempt something related to the Third Magic that could grant unlimited magical power.
• Li Yu admitted to Mugino Shizuri and the other ITEM members that he wanted them to test meditation, refused to let them leave, and forced them to choose between cooperating or being controlled.
• Takitsubo Rikou entered meditation first, prompting Mugino Shizuri, Frenda Seivelun, and Kinuhata Saiai to try meditating as well.
• Li Yu observed magical power forming in the girls and sensed that Mugino Shizuri's had a lightning attribute, leading him to wonder whether Academy City's espers could learn magic tied to their abilities.

Li Yu brought the ITEM group from Academy City to his world after their meditation awakened mana, then arranged for them to study magic at Otherworld Academy. Mugino Shizuri questioned the plan, and the four appeared unwilling to be kept there.

• Li Yu confirmed that the ITEM group had gained power through meditation and transported them back to the windowless room.
• Li Yu asked Aleister to spread the Breathing Method throughout Academy City, and Aleister agreed.
• Li Yu reunited with Index and the ITEM group in his world and took them to Boundary University.
• Principal Hu agreed to enroll Mugino Shizuri and the others at Otherworld Academy while Li Yu planned for Pandora to help Index.
• Mugino Shizuri asked if Li Yu had brought them there just to study, and Li Yu told them they would be staying for some time.

Li Yu arranged support for the four espers he had brought from Academy City and explained their potential to Principal Hu. He then took Index to meet Hestia, who agreed to let her stay with her.

• Mugino Shizuri asked Li Yu how to contact him, and Principal Hu arranged university passes and funds for the four espers.
• Li Yu told Principal Hu that Academy City had 2.3 million people with developed esper abilities who could learn magic, and admitted that the espers had attacked him before he brought them back.
• Li Yu explained that Index had recorded 103,000 magic books, and Principal Hu welcomed her and supported arranging for Pandora to provide her with abundant mana.
• Li Yu obtained identification documents for Index and took her to the library, where Heroic Spirits were working among the magic arrays on the sealed third floor.
• Li Yu introduced Index to Hestia and asked her to take Index in, and Hestia agreed.

Li Yu brought Index to Hestia and discussed rebuilding the Hestia Familia in the dungeon world with Bell. He then checked on Pandora, who had nearly absorbed the Root and discovered a dangerous universe beyond a sealed passage; Li Yu recognized it as the world of the Astral Express and Paths.

• Li Yu introduced Index and her 103,000 recorded grimoires to Hestia, who agreed to look after her while postponing Falna and other plans for her.
• Li Yu proposed rebuilding the Hestia Familia in the dungeon world, and Hestia agreed to return with Bell.
• Li Yu visited Pandora in the Type-Moon world and asked her to help Index complete the Third Magic, which Pandora readily accepted.
• Pandora explained that the world beyond the passage had universe-level powerhouses, rule-based Paths, and beings capable of destroying star systems.
• Li Yu asked whether the world had the Astral Express and Paths, and Pandora asked him to explain what he knew about it.

After bringing Li Yu back from A Certain Magical Index, Pandora began taking control of that dangerous world and promised to handle Index’s disappearance. Li Yu headed to KonoSuba World, where Asuna and the Special Class students were preparing to assault the Demon King’s Castle, while Index’s friends searched for her in Academy City.

• Pandora reinforced the seal on the A Certain Magical Index world, returned Li Yu to their world, and began spreading her will through it to take control.
• Li Yu read reports about Boundary Island’s ascent and new role as a restricted checkpoint, then set off for KonoSuba World.
• Kanzaki Kaori and Stiyl Magnus reported Index missing, and Laura Stuart discovered that her connection to Index had been severed.
• Laura questioned Aleister, who admitted someone had taken Index and said he could not stop them, then ordered Kanzaki and Stiyl to continue searching.
• Li Yu arrived in KonoSuba World and found Asuna and the Special Class students camped near the Demon King’s Castle, preparing for their final assault after a battle that left some students injured.