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.