Vol. 4Worlds Beyond the Library

Li Yu advanced his mastery of time and space, brought companions and allies together across worlds, and built Abant into a base for interworld journeys. After finding Jhana in the Nasuverse, he learned she was the Herrscher of the Sea.

  • Li Yu broke through to the tenth rank by mastering time and space, then entered Academy City and began training Kamijou Touma.
  • Li Yu gave Touma a strength-enhancing serum and brought him to Tokiwadai Middle School to test Imagine Breaker.
  • Li Yu restored Index’s memories and brought her and the ITEM members to his world, while his companions defeated the Demon King and settled in Abant.
  • Li Yu discovered a growing rift on the moon’s far side and led Abant’s forces to confront the mechanical invaders.
  • Li Yu conquered the E.E. world and entered the Xianzhou as the last survivor of Cangcheng, becoming an Emanator of Erudition and the Hunt.
  • On Amphoreus, Li Yu helped return the unconscious Trailblazers to the Astral Express, retrieved the Scepter of the Emperor, and used it to awaken Star and Dan Heng.
  • Li Yu became an Emanator of Trailblaze, opened a route into the Sea of Quanta, and reunited with Asuna and his companions in Teyvat.
  • Li Yu passed through a relocated passage into the Nasuverse, found Jhana asleep, and learned she was the Herrscher of the Sea.
Chapters 302–402 Read from Ch. 302

Arc 13Laws, Worlds, and a New Student

Li Yu arranged cooperation across worlds, brought new students to train in the fantasy world, and broke through to the tenth rank by mastering time and space. He then entered Academy City, where he began training Kamijou Touma and tested a serum that greatly increased Touma’s physical strength.

  • Li Yu visited Granny Setsuno with Erina and Jibril, shared the last Wall Penguins, and exchanged techniques with Ichiryu and Jiro while Erina experienced Century Soup.
  • Li Yu arranged contact between his world and the Gourmet World, then assembled a team to train in Asuna’s world and helped them learn magic and pursue Aqua’s cheat items.
  • Li Yu found the Sacrifice talent in his soul, removed its cost, and fused with his parallel selves before using the Root to master the Fifth Magic.
  • Li Yu combined his control of time and space to break through to the tenth rank, then explained laws and the path beyond the Ninth Tier to Think and the Flugel.
  • Li Yu brought Erina, Hisako Arato, and Alice to Asuna’s world for training, then enlarged Betty’s library and helped Da Vinci activate Boundary Island as a flying fortress.
  • Li Yu entered the world of A Certain Magical Index, delivered Pandora’s message to Aleister, and agreed to teach Kamijou Touma how to protect himself.
  • Li Yu taught Touma a breathing technique, then created a strength-enhancing serum with Gourmet Cells and gave it to him after three days of practice.
  • Li Yu took Touma to Tokiwadai Middle School for testing, where Misaka Mikoto, Shokuhou Misaki, Shirai Kuroko, and Hokaze Junko watched as he prepared to test Imagine Breaker.
Chapters 302–32625 summaries Read

Arc 14Worlds Converge

Li Yu restored Index’s memories, brought her and the ITEM members to his world, and helped his companions defeat the Demon King and settle in Abant. After discovering a growing rift on the far side of the moon, he led Abant and its forces to confront the mechanical invaders.

  • Li Yu trained Kamijou Touma, revealed the worlds and magic to him and Shokuhou Misaki, and stopped an attempt to abduct Touma by killing the people on Aleister’s list.
  • Li Yu removed Index’s collar, restored her memories, copied her grimoires, and brought her to his world, where Hestia agreed to look after her and Pandora began helping her pursue the Third Magic.
  • Li Yu brought Mugino Shizuri and the other ITEM members to his world, arranged their enrollment at Otherworld Academy, and asked Aleister to spread the Breathing Method through Academy City.
  • Asuna led the final assault on the Demon King, and Li Yu froze him so Yukino could behead him before the group returned to his world with the goddesses.
  • Li Yu took Asuna’s group to Abant, transformed it into a modern city, and explained how they could travel between it and the library.
  • Pandora detected mechanical invaders emerging through a rift on the far side of the moon, so Li Yu sent Abant and the Flugel toward them and summoned Ex-Machina support.
  • Li Yu and Einzig found the expanding rift and a humanoid robot on the moon’s far side, and Li Yu moved to capture it.
Chapters 327–35125 summaries Read

Arc 15The Cangcheng Heir

Li Yu conquered the E.E. world, prepared his companions for journeys to new worlds, and entered Honkai: Star Rail as the last survivor of Cangcheng. On Amphoreus, he rescued the Trailblazers and acquired the Scepter of the Emperor for Abant’s computer.

  • Li Yu and the Ex-Machina devastated the E.E. world, defeated Melvazoia, and gathered its knowledge while Pandora claimed the world’s origin.
  • Li Yu returned to Abant, reunited with his companions, and helped build the island into a self-sufficient base while planning journeys to other worlds.
  • Li Yu brought Asuna home to meet her family, then restored Jibril and the other exhausted Flugel after their battle.
  • Pandora sent Li Yu, the Flugel, and the Ex-Machina to the Xianzhou as the last survivors of Cangcheng, and Nous and Lan made Li Yu an Emanator of Erudition and the Hunt.
  • Li Yu met Jing Yuan, shared Cangcheng’s core with the Xianzhou, and was appointed a Marshal of the Xianzhou Alliance.
  • Li Yu traveled to Amphoreus with Herta and Screwllum, identified Lygus as Zandar, and helped return the unconscious Trailblazers to the Astral Express.
  • Li Yu summoned Lan to destroy Phantyl’s Antimatter Legion, then retrieved the Scepter of the Emperor from Lygus and used it to awaken Star and Dan Heng.
Chapters 352–37725 summaries Read

Arc 16The Sea of Quanta Expedition

Li Yu became an Emanator of Trailblaze, opened a route into the Sea of Quanta, and reunited with Asuna and his companions in Teyvat. After helping them embark on the Path and confronting the Company, he traveled through a relocated passage into the Nasuverse and found Jhana.

  • Li Yu brought Herta to Abant, helped her develop magic, and began searching the universe for signals from his missing companions.
  • Herta implanted Stellarons into herself and March 7th, while Li Yu joined the Astral Express and became an Emanator of Trailblaze.
  • Li Yu and a team of geniuses opened a passage into the Sea of Quanta, where they tested magic against Quantum Phantoms and prepared a larger route.
  • Li Yu coordinated with the Xianzhou to search for Cangcheng’s survivors, while Herta’s team built a star ring and the Astral Express laid a Star Rail into the Sea of Quanta.
  • Li Yu used the Astral Express to reach Teyvat, reunited with Asuna and his companions, and introduced them to Liyue’s leaders.
  • Pom-Pom let Asuna and the others board the Astral Express and advance on the Path of Trailblaze, while Lumine regained her memories and strength.
  • Li Yu returned to Abant and ordered the Flugel to destroy the Company fleet after it ignored Xianzhou warnings, then closed the passage and moved Abant toward another route.
  • Li Yu passed through the relocated passage into the Nasuverse, found Jhana asleep, and learned from Pandora that she was the Herrscher of the Sea.
Chapters 378–40225 summaries Read
Volume 4 of 7
Volume 4 of 7