Arc 21The System and the Grail

Leon fused the Resident Evil and Wandering Earth worlds, then introduced the Universal Exchange System to the Dragon Clan world and led its users into battle against Odin. He later accompanied Eri through the Holy Grail War and helped her become the new King Arthur.

  • Leon helped fuse the Resident Evil and Wandering Earth worlds, created serum doses for their people, and left the Resident Evil World's affairs to Ada, Jill, and the World Consciousness.
  • Leon entered the Dragon Clan world, showed Chu Zihang his father's fate, and gave him access to the Universal Exchange System, which soon reached Lu Mingfei and other Mixed-Bloods.
  • Lu Mingfei, Chu Zihang, Caesar, Angers, Eri, and other system users traveled to the Arctic, where they fought Leviathan and entered the Nibelungen.
  • The fighters battled over the Black King as Pompeii revealed himself as Odin and began devouring it, but Chu Zihang's Bankai burned Odin while Lu Mingze's illusion prevented him from restarting the Worldline.
  • Leon visited Eri, agreed to take her to another world, and brought her into the Holy Grail War, where she became Saber’s Master.
  • Leon opened a passage to The Root through the Holy Grail, and Eri purified its corruption before the arriving Masters and Servants were killed by Leon's Kill Intent Rebound.
  • Emiya Kiritsugu and Artoria made their wishes, and Eri wished to help Saber before traveling with Leon to the day Artoria drew the Sword in the Stone.
  • Eri drew the Sword in the Stone before the gathered knights, and Artoria knelt to swear loyalty to her as King Arthur.
Chapters 501–525 Vol. 6 Read

Ch. 501World Fusion

Leon traveled through the One Piece and Bleach worlds, where his enhanced Kill Intent Rebound caused widespread deaths, then returned to the Resident Evil World after its World Consciousness began merging it with another universe. As the worlds started to overlap, Leon learned the identity of the other world and sent Ada to make contact with its Earth.

  • Leon arrived during the Marineford War, and Kill Intent Rebound killed or injured many pirates and Marines who felt malice toward him.
  • Leon visited Mary Geoise and left it covered in blood before traveling to the Bleach World, where Aizen, Yhwach, and others collapsed after reacting to him.
  • Leon returned Ryujin Jakka to Yamamoto, healed him, and left; Seireitei established Soul Reaper Day, while Leon's M-Body continued watching them.
  • Leon discovered that the Resident Evil World had begun merging with a neighboring universe, returned to Raccoon City, and slowed the worlds' collision through his M-Body.
  • Leon learned about the other universe as the worlds began to merge and instructed Ada Wong to lead a team to contact its Earth.

Ch. 502The Wandering Earth World

Ada Wong arrived in the Wandering Earth world and told the United Government that the worlds were fusing and their savior would intervene. A young man kicked the Moon back into orbit and stabilized the Sun, leaving humanity’s extinction crisis apparently averted.

  • Ada Wong led an armed squad through a spatial portal and learned that Zhou Zhezhi in the other world had received memories from his counterpart.
  • Zhou Zhezhi brought Ada Wong to the United Government command room, where she announced that world fusion was underway and told the astronauts to stop trying to destroy the Moon.
  • Liu Peiqiang and Amelia stopped their lunar mission and saw a young man floating above them before he stomped the Moon away from Earth.
  • Experts in the United Government command room reported that the Moon had returned to orbit and the Sun’s expansion was shrinking.
  • Ada Wong told the national representatives that their savior had acted.

Ch. 503Authority Dilution

The two Earths became adjacent in a stable binary star system rather than merging into one planet, while Leon completed the fusion of their worlds. The immense scale of the Wandering Earth universe diluted Leon’s and World Consciousness’s Authority, and World Consciousness urged Leon to use his share to claim ownership of the universe.

  • The United Governments announced the approaching world fusion, and people in both worlds reacted with disbelief, curiosity, or confidence.
  • The sky reflections vanished, and Ada Wong explained that the worlds had fused but the Earths remained separate and adjacent.
  • Technicians confirmed that the Solar Systems had become a stable binary star system, and Zhou Zhezhi welcomed the chance for the two Earths to coexist peacefully.
  • Leon adjusted the celestial bodies and completed the fusion, discovering that his and World Consciousness’s Authority had shrunk to one trillionth of the universe.
  • World Consciousness urged Leon to leverage his Authority over the universe, and Leon joked that it could keep bringing in other worlds for him to merge.

Ch. 504After the Fusion

After the worlds merged, Leon left the rebuilding and serum distribution to others while preparing to explore new universes. Tu Hengyu joined a delegation to seek advanced artificial intelligence technology and a way to preserve his daughter Yaya, and Leon departed into the Void beyond the worlds.

  • The two Earths established diplomatic ties, and Leon created billions of serum doses before Ada took charge of distributing them, starting with Rabbit Country and the Wandering Earth Project heroes.
  • Liu Peiqiang spoke with Tu Hengyu as they queued to cross into the Resident Evil World for enhancement, and Tu Hengyu explained that he hoped to find a way to preserve Yaya's digital life.
  • Leon began bringing worlds such as Harry Potter, Prototype, and Hokage near the Resident Evil World, but held them back while the World Consciousness drew over a larger universe.
  • Leon entrusted the Resident Evil World's affairs to the World Consciousness, Ada, and Jill, then entered the Void to travel to another universe.

Ch. 505Dragon Clan's World

Chu Zihang watched a storm that reminded him of the day his father died and saw Lu Mingfei run into the rain. A mysterious man appeared, explained that Chu Zihang's world was called Dragon Clan, and showed him its history as a river of time.

  • Chu Zihang recalled his father Chu Tianjiao's death as he watched Lu Mingfei run through the rain, then decided to offer him a ride.
  • A strange man appeared beside Chu Zihang and identified Lu Mingfei as the protagonist and Chu Zihang as a character in the Dragon Clan world.
  • Chu Zihang asked whether Odin was a god, and the man proposed that they look for Kassel Academy together.
  • The man summoned a river of time and showed Chu Zihang the history of the Dragon Clan, from Black King Nidhogg's creation of the White King and Four Great Sovereigns to the Mixed-Bloods' rebellion.

Ch. 506Naruto, Bleach, and One Piece Gift Pack

Chu Zihang learned that his father was still alive in Odin’s Nibelungen and discovered that Lu Mingfei appeared in the Time River as a powerful Black King. After Chu Zihang asked Leon for power to rescue his father, Leon gave him a golden bean that activated a system offering three gift packs.

  • Chu Zihang saw that Odin had made his father, Chu Tianjiao, a puppet but kept him alive in the Nibelungen.
  • Chu Zihang saw Lu Mingfei in the Time River as a figure whose power rivaled the Black King, then asked Leon whether Lu Mingfei was a Dragon King.
  • Leon practiced the Dragon Clan’s alchemy kingdoms, creating and destroying several conceptual weapons before sending Chu Zihang home.
  • Chu Zihang asked Leon for power to save his father, and Leon gave him a golden bean as the price of gaining power.
  • The golden bean activated the Universal Exchange System and offered Chu Zihang a choice of Naruto, Bleach, or One Piece gift packs.

Ch. 507Do You Want to Truly Live?

Chu Zihang chose the Reaper Gift Pack to gain the strength to find his father and avenge himself on Odin, but its delivery paused when his stepfather arrived. Meanwhile, the Universal Exchange System appeared to Mixed-Bloods worldwide, and Lu Mingfei agreed to its terms without noticing that it would extract his superpowers.

  • Chu Zihang chose the Reaper Gift Pack after learning its modifications would greatly increase his strength, and confirmed he was willing to become less than fully human.
  • The system paused Chu Zihang's gift delivery when his stepfather approached, then activated worldwide and sent a prompt to Mixed-Bloods with Dragon Clan blood of grade C or above.
  • Chu Zihang hid the golden bead, left with his stepfather, and thanked him.
  • Lu Mingfei fell in the rain, fled into an alley, and stared at a vivid QQ-style system dialogue box.
  • Lu Mingfei tapped Yes, agreeing to the Universal Exchange System without noticing its fine print about extracting his superpowers.

Ch. 508The System's Lavish Giveaway

After accepting the Universal Trading System, Lu Mingfei discovered it had given him 300,000 points and began buying powerful magic and equipment. He accidentally blasted a crater in the road, repaired it, erased witnesses’ memories, and then found the system had bought several more costly items after he merely mentioned them.

  • Lu Mingfei accepted the system and learned he could trade possessions or complete missions for points.
  • Lu Mingfei found a 300,000-point balance and bought Expelliarmus, a powerful wizard gene package, and a Uru Metal Thunder Wand.
  • Lu Mingfei’s Expelliarmus spell blasted a large crater into the road, so he bought Reparo and restored it.
  • Lu Mingfei bought Obliviate after people reacted to the blast and confirmed the system was real.
  • Lu Mingfei listed several expensive items he wanted to try, and the system confirmed their purchase without asking him first.

Ch. 509Task One: Confession

Lu Mingfei bought an array of powers and fruits before the system ordered him to confess to Chen Wenwen, exposing his feelings and sending him fleeing through the rain. Leon revealed that he had issued the task, while Caesar accepted the system and began shopping.

  • Lu Mingfei regretted buying overlapping abilities, then spent his remaining points on powers and fruits for himself and the people close to him.
  • The system ordered Lu Mingfei to confess to Chen Wenwen in front of the class, and he panicked, denied liking her, and tried unsuccessfully to unlink from the system.
  • Leon said he had issued Lu Mingfei's confession task and sent the badly injured Xia Mi through a rift into the Nibelungen at the BJ subway station.
  • Leon looked over the people facing the system's choice as Caesar accepted it aboard a boat in the Gulf of Genoa and bought Conqueror's Haki.

Ch. 510Reactions from All Sides

Angers, the boy, Fenrir, Xia Mi, and Eri responded to a mysterious system offer that stripped away dragon bloodlines in exchange for new abilities. The boy recognized Lu Mingfei as an outsider who could bring hope, while Xia Mi and Angers emerged transformed and the story ended with Eri accepting the offer.

  • Angers rejected the theory that the dialogue box was a Dragon King's trap, bound himself to the system, and bought Reaper Transformation, an Asauchi, and speed abilities.
  • The boy discovered that his brother's aura had vanished, then saw Lu Mingfei and recognized him as hope from beyond the world before binding himself to the system and buying powerful abilities.
  • A wounded boy in a Siberian Nibelungen opened his eyes after the system activated.
  • Fenrir appeared to Xia Mi as a nine-tailed fox and urged her to accept the system, and she pressed “Yes” as their Nibelungen collapsed.
  • Xia Mi emerged from the old subway station in Nine-Tails Mode and flew into the sky.
  • Eri paused her game in Genji Heavy Industries Tower and pressed “Yes” on the dialogue box.

Ch. 511Little Monster and Ultraman

Eri browsed the system store and bought Ultraman Legend's Trial, believing an Ultraman was about to kill her. Leon traced the purchase to Eri and transformed into light, arriving at the Genji Heavy Industries building as light engulfed her sealed room.

  • Eri explored the store, whose goods brought her excitement despite her isolation and limited understanding of the real world.
  • Eri saw Ultraman Legend's Trial, panicked, and bought it for 1,000 points before hugging her toys and bracing for death.
  • Leon studied the Dragon Clan's Authorities while watching Lu Mingfei get sent out to buy soy sauce.
  • Leon traced the purchase to Uesugi Eri rather than Genji Yash and flew to the Genji Heavy Industries building using the Will of the Macrocosm.
  • Pure light poured into Eri's room and engulfed her.

Ch. 512Eri Becomes Light

Leon healed Uesugi Eri and put her through an illusion based on Ultraman Cosmos, where she learned to use her new powers and passed his trial. She returned home as Ultraman Cosmos, while Leon observed his other system users preparing to fight the Black King and Odin.

  • Uesugi Eri mistook the gigantic Ultraman Legend for a threat until Leon explained that he had healed her and asked whether she was ready for her trial.
  • Leon placed Eri in an illusion based on Ultraman Cosmos, where she became Cosmos and faced monsters and tests of her resolve, character, and courage.
  • Eri passed the trial, and Leon told her to protect the gentle world as Ultraman Cosmos before she returned to her room.
  • Genji Yash rushed in with researchers and medical staff, and Eri told him she had become light before transforming into a human-sized Ultraman Cosmos.
  • Several days later, Leon watched the users who had gained powers through the system head to the Arctic Ocean for the first-kill mission against the Black King and Odin.

Ch. 513Setting Out for the Arctic Ocean

Lu Mingfei and Su Xiaoqiang traveled aboard the YAMAL to the Arctic Ocean after taking system missions, and they bickered in the casino as other passengers watched them. The chapter ended with three men approaching Lu Mingfei while the passengers suspected one another of having systems.

  • Lu Mingfei’s system missions pushed him to confess to Chen Wenwen, but he panicked, offered to share a milk tea deal, and fled after his classmates laughed.
  • Su Xiaoqiang comforted Lu Mingfei with a bag of chips, and he gave her the Devil Fruits he had prepared for her and Chen Wenwen.
  • Lu Mingfei and Su Xiaoqiang accepted more system missions and traveled to Nuuk Port, where they boarded the YAMAL for the Arctic Ocean.
  • In the casino, Lu Mingfei denied staring at a Belarusian dealer while Su Xiaoqiang twisted his ear, and the passengers quietly watched one another for signs of system users.
  • A muscular blond man, a poker-faced black-haired man, and a flirtatious white-haired old gentleman approached Lu Mingfei.

Ch. 514The Giant Whale and the Serpent Swarm

Lu Mingfei encountered Chu Zihang, Caesar, and Angers aboard the YAMAL, then learned that the ship had capsized in an attack by a monstrous creature called Leviathan. As serpent-like creatures swarmed the survivors, Caesar unleashed his power and challenged the monster.

  • Lu Mingfei and Su Xiaoqiang met Chu Zihang and Caesar, while Angers welcomed them and spoke of their coming battle against Dragon Kings.
  • A boy with a black longsword told Lu Mingfei to enjoy a life beyond fate, and Lu Mingfei later reunited with Old Tang and met his younger brother, Little Tang.
  • The YAMAL capsized during the night, and Lu Mingfei, Old Tang, and Little Tang escaped their flooded cabin as serpent-like creatures swarmed the wreck.
  • Lu Mingfei used Shinra Tensei to blast away the seawater and kill the serpent swarm, while Su Xiaoqiang rescued herself from her cabin.
  • Lu Mingfei reached the surface and saw the surviving passengers facing Leviathan, a massive white, spined monster that had capsized the ship and attacked with its whale song.
  • Caesar rose into the sky, unleashed Conqueror's Haki, and challenged Leviathan to submit to him.

Ch. 515Entering Nibelungen

Caesar, Lu Mingfei, and Chu Zihang fought Leviathan, with Chu Zihang badly wounding the Dragon King using Ryujin Jakka. A Nibelungen opened beneath the sea and drew Leviathan and the treasure seekers inside, leaving the survivors on an island surrounded by an ancient arena.

  • Caesar used Conqueror's Haki against the Deadpools, but Leviathan leaped from the sea and attacked the group.
  • Lu Mingfei summoned an Ice Release narwhal that collided with Leviathan and shattered the towering waves.
  • Chu Zihang kicked Caesar out of danger, then used Ryujin Jakka's Pine Torch to burn and grievously wound Leviathan.
  • Xia Mi recognized Leviathan as the King of Ocean and Water, while the crowd eyed the Dragon King's bones with greed.
  • Lu Mingfei spotted a vortex forming beneath the sea, and Xia Mi realized Leviathan's blood and bones had opened a Nibelungen.
  • The whirlpool dragged Leviathan underwater, and the treasure seekers followed before emerging near an island encircled by an ancient arena.

Ch. 516Brawl and Odin's Suspicions

Chu Zihang found his father among Odin’s Heroic Spirits and destroyed most of Valhalla, while the others fought over the remains and the Black King. As the battle raged, Odin watched from Pompeii’s body and planned to devour the Black King, Leviathan, Xia Mi, and Old Tang.

  • Chu Zihang found Chu Tianjiao in a coffin, shattered his Odin mask, and destroyed every other Heroic Spirit on the island with Black Coffin.
  • The crowd rushed to claim and sell the Heroic Spirits’ bodies, but Cosmos used Full Moon Wave to take them and pulled the Black King from the sea.
  • Xia Mi and Old Tang recognized the Black King and charged toward him, prompting the other factions to join the fight.
  • Xia Mi, Lu Mingfei, Cosmos, Angers, Fingel, and the rival factions unleashed their powers as the Black King’s body became the center of the brawl.
  • Pompeii revealed that he was Odin and suspected the Black King had created the system, then resolved to devour the Black King and Leviathan before targeting Xia Mi and Old Tang.

Ch. 517Devouring the Black King

Odin attacked the wounded Black King and devoured its blood and flesh to seize its power, but Xia Mi and the others discovered him and moved to stop him. He had consumed nearly two-thirds of the Black King as the battle closed in around him.

  • Pompeii transformed into Odin and used a time-related Word Spirit to reach the Black King before the others could react.
  • Odin stabbed the Black King through the skull and began devouring its blood and flesh, gaining Supreme Authority.
  • Xia Mi spotted Odin and called for everyone to stop him, while Chu Zihang joined the attack after entrusting Chu Tianjiao's coffin to Angers.
  • Odin tried to distract Xia Mi and the Norton brothers with an emotional appeal, then revealed Herzog's identity to Eri Uesugi to win her help.
  • Genji Yash explained that Herzog had already confessed after being struck by Eri's Full Moon Wave, so Eri let Xia Mi and the Norton brothers attack Odin again.
  • Odin fought off the attackers while continuing to devour the Black King, having consumed nearly two-thirds of it.

Ch. 518Mission's End

Chu Zihang confronted Odin, who consumed the Black King and tried to rewrite the Worldline, but Lu Mingze revealed that Odin had been trapped in an illusion and Chu Zihang killed him. After the mission was completed, Leon collected the Dragon Kings’ bloodlines and discovered that Eri had bought more than a hundred Legend’s trials before he left.

  • Chu Zihang rejected Odin’s offer and challenged him over the rainy-night Maybach incident, then unleashed Bankai: Zanka no Tachi as Odin began dragonifying.
  • Odin absorbed the Black King and restarted the Worldline, believing he had returned to the moment he could bind the system.
  • Lu Mingze revealed that Kyoka Suigetsu had made Odin’s apparent victory an illusion, and the real Black King was still alive.
  • Chu Zihang’s flames consumed Odin and completed the mission, while Lu Mingze explained that he had planted the illusion on the YAMAL.
  • Leon gathered the Dragon Kings’ bloodlines, then learned that Eri had spent her points buying more than a hundred Legend’s trials and decided to visit her before leaving.

Ch. 519Over a Hundred Trials

After Odin's fall, Eri remained in the Sheqi Eight Houses, longing for Legend after he disappeared. Leon returned and explained the trials before preparing a real Ultraman Legend's Trial for her.

  • Eri became a respected Tsukuyomi-no-Mikoto but remained focused on Ultraman and worried that Genji Yash might leave.
  • Eri repeatedly purchased Legend's Trial, spending all her points when Legend failed to appear.
  • Eri waited in her room, convinced she had no other way to find Legend, until Leon crossed space and appeared before her.
  • Eri asked Leon where he had gone and learned that the trial's illusion had been created by his mind, though her experiences in it were real.
  • Leon told Eri that he planned to visit another real world and prepared a genuine Ultraman Legend's Trial for her.

Ch. 520May I Ask, Are You My Master?

Leon agreed to take Eri to other worlds, and the two left the Genji Heavy Industries building together. Eri awakened in a cathedral beside Artoria and became Saber’s Master.

  • Eri asked Leon to take her along because she wanted to keep seeing him and explore other worlds, and he agreed.
  • Eri packed her treasured dolls, left a message for her brother through Kaguya-hime, and departed with Leon.
  • Genji Yash learned that Eri had gone with Leon and lamented her leaving.
  • Eri awoke in a cathedral beside Artoria, Irisviel, and Emiya Kiritsugu, with Leon behind her.
  • Emiya Kiritsugu’s Command Spells transferred to Eri, and she declared herself Saber’s Master.

Ch. 521Holy Grail War

Leon joined the Holy Grail War in Emiya Kiritsugu’s place in exchange for fulfilling Kiritsugu’s wish, while Eri tried out Artoria’s Excalibur. Leon warned Kiritsugu and Artoria that the Grail would disappoint them, then opened a portal to take the group to Fuyuki City.

  • Eri swung a magically forged copy of Excalibur in the snowy forest while Illyasviel cheered her on and Artoria watched in amazement.
  • Artoria questioned Leon about his power and why he was entering the Holy Grail War, and he explained that he had traded places with Emiya Kiritsugu.
  • Kiritsugu revealed that he wished for world peace, and Leon confirmed that he had agreed to fulfill that wish.
  • Leon warned Kiritsugu and Artoria that their expectations of the Holy Grail would bring disappointment.
  • Leon called Eri over, opened a Mystic Arts Portal, and led the group toward Fuyuki City.

Ch. 522Make a Wish Ahead of Time

Leon brought Emiya Kiritsugu, Irisviel, Artoria, and the others to Fuyuki, where he extracted Irisviel’s Lesser Holy Grail and activated it. He opened a passage to The Root and invited Artoria and Emiya Kiritsugu to make their wishes, warning them that the corrupted Grail would twist them through human evil.

  • Leon brought the group through a portal to a temple overlooking Fuyuki, where Eri and Illya excitedly photographed the city.
  • Leon revealed that Irisviel was the Lesser Holy Grail, and Irisviel explained her role and the Einzbern Family’s mission to Emiya Kiritsugu.
  • Leon activated the Holy Grail system and created tiny Artorias, whose souls entered the Grail and opened a passage to The Root.
  • Masters across Fuyuki rushed toward the temple after seeing the passage appear before the Holy Grail War had begun.
  • Leon invited Artoria and Emiya Kiritsugu to make their wishes, warned them that the Grail was corrupted, and watched as they approached it.

Ch. 523Purifying the Black Mud

Eri used her giant form and Moon Goddess Purification Beam to cleanse All the World's Evil from the Greater Holy Grail, while Leon explained the Grail’s limits and its connection to The Root. As the purification ended, the Masters and Heroic Spirits converged on Ryuudou Temple, bringing the Holy Grail War close to starting early.

  • Eri transformed into a giant and fired a Full Moon Wave at the hole above Fuyuki City, but it did not stop All the World's Evil.
  • Eri used the Moon Goddess Purification Beam to separate the Black Mud from the Greater Holy Grail and clear the sky.
  • Emiya Kiritsugu and Artoria awoke after being expelled from the Holy Grail, devastated by the answers it had given them.
  • Leon told Artoria and Emiya Kiritsugu that the corrupted Grail had distorted their wishes, explained how it could reach The Root, and said it might not fulfill every wish.
  • Eri finished purifying the Greater Holy Grail, and Gilgamesh, the King of Conquerors, Hundred-Faced Hassan, Lancelot, and Zouken Matou arrived at the temple.

Ch. 524Arrival at The Root

Leon’s Kill Intent Rebound wiped out the hostile Servants and Zouken Matou, leaving the survivors to make their wishes on the Holy Grail. Leon entered The Root and began absorbing its knowledge, then returned his attention to Eri and told her to make her wish.

  • Leon’s Kill Intent Rebound killed Gilgamesh, Iskandar, Lancelot, Hundred-Faced Hassan, and Zouken Matou after they became angry.
  • Eri confirmed that the Holy Grail War was won, and Emiya Kiritsugu wished for his wife and daughter to return to normal human beings.
  • Artoria wished to return to the moment she drew the sword from the stone and find a more suitable king, and the Holy Grail sent her away to fulfill it.
  • Eri let Leon go first, and he entered The Root after receiving a welcoming message from the Counter Forces.
  • Leon studied the information within The Root through an M-Body, then told Eri to make her wish.

Ch. 525Eri's Wish

Eri used the Holy Grail’s remaining energy to help Saber fulfill her wish and was transported with Leon to the day Artoria drew the Sword in the Stone. Eri became the new King Arthur, while Artoria pledged loyalty to her.

  • Eri wished for the Holy Grail to help Saber, and its magic carried her and Leon to the past after Leon said goodbye to the Emiya family.
  • Artoria returned to the day she drew the Sword in the Stone and waited for the king she believed the Holy Grail would choose.
  • Leon and Eri appeared above the Sword in the Stone, and Eri drew it as the gathered knights watched.
  • The knights objected to a woman becoming king, but Leon’s power swiftly silenced them when their insults turned toward him.
  • Artoria knelt before Eri and swore loyalty to her as King Arthur.
Arc 21 of 26