Chapter Summaries

Iori continued training in Hueco Mundo until his growth slowed, then reunited with his sister Yuki Aizen, who had arrived on a purification mission. He returned to Chaldea and agreed to help with its busy workload, leaving Merlin to take him toward the command room.

• Iori honed his combat skills in Hueco Mundo and reached roughly Captain-level strength without using Bankai.
• Yuki Aizen arrived with Thirteenth Division members to purify spirit-body remains, and she asked Iori to help with her exhausting work.
• Iori and Yuki discovered that their Shikai, Mirror Water and Kyoka Suigetsu, were both water-type, then teased each other about their names.
• Iori returned to Chaldea, where Merlin welcomed him and explained that Ritsuka was busy dealing with a Lostbelt.
• Iori agreed to help Chaldea, and Merlin led him to the central command room and the Simulated Planet, Chaldeas.

Iori entered Chaldea’s summoning array to be sent to a Holy Grail War, but the system identified him as a nameless Heroic Spirit and assigned him the name Susanoo-no-Mikoto. In the war, a Master noticed his contract with his Servant faltering, then found the Servant stable in his room and addressed him as his king.

• Merlin explained that Iori had to create a Singularity by disrupting a Holy Grail War and led him to Chaldea’s summoning room.
• Iori stepped into the summoning formation, and Merlin activated the system to check his Class compatibility and transfer him.
• The summoning system detected Iori’s legends and registered him as Berserker (Saber), Susanoo-no-Mikoto, with the true name Iori Aizen.
• A Master noticed that his mana channel with his Servant had weakened, then hurried to the Servant’s room to investigate.
• The contract stabilized as the Master entered, and he approached the white-haired Servant and called him his king.

In 1990s London, a silver-haired homunculus was hunted through the streets by armed pursuers seeking the secret of the Holy Grail. Cornered on a subway platform, she denied that her diminished family still possessed the inheritance they wanted.

• The silver-haired girl fled gunfire through London's streets, using her knowledge of the side roads to evade her pursuers.
• She realized the hunters had altered the routes with a people-warding barrier and cognitive magecraft.
• The girl stopped on an empty subway platform and calmly faced the unseen hunters.
• A disguised voice demanded the origin of magecraft, the Final Form of the Demonic Path, and the key to eternal life.
• The girl explained that her family had lost its Holy Grail inheritance and wealth after decades of failed attempts to recreate the Greater Holy Grail.
• The hunters fell silent, then fired a gun.

Iori Aizen became Sella Von Einzbern’s Servant after his summoning interrupted an ambush, then learned how badly the Einzbern family had declined and how severely Sella had damaged her body. In a London hotel, Sella agreed to help him obtain a living body through the Holy Grail, while Iori promised to protect her until victory.

• Sella Von Einzbern began summoning a Servant while fighting off hidden attackers, but their blast interrupted her chant and left her badly injured.
• Iori Aizen emerged from the activated summoning circle, defeated the attackers, and completed his contract with Sella as a Berserker.
• Iori learned that Darnic had destroyed the Einzbern family’s standing and that Sella was its last surviving homunculus, created to compete in the Fourth Holy Grail War.
• At a London hotel, Iori examined Sella’s injuries and found that her overuse of magecraft had caused irreversible damage to her body.
• Sella cautiously questioned Iori about his wish, and he said he wanted to live in the world in another form of life.
• Sella promised to help fulfill Iori’s wish, and Iori began to confirm something with her.

Ciel asked Lord El-Melloi II to recognize her as a Mage's Association Master so she could enter the Romania Holy Grail War with faction backing. He refused, leaving her without the protection she sought as she prepared to face Darnic and Yggdmillennia.

• Iori took charge of Ciel's strategy and learned that her damaged Magic Circuits could make mana transmission difficult.
• Ciel visited Lord El-Melloi II in London and asked him to support her participation in the Holy Grail War as an Association member.
• Ciel revealed her Command Spells and explained that she had already summoned a Servant through an Einzbern loophole.
• Ciel told Lord El-Melloi II that she needed the Association's protection because Darnic would target her as an Einzbern.
• Lord El-Melloi II refused, citing the Clock Tower's exclusion of the Three Great Families and his unwillingness to get involved in the conflict.

Ciel secured a Master slot in the Holy Grail War by promising Lord El-Melloi II money and Rhinegold, following Iori’s advice. After learning that Shirou Kotomine was the Red faction’s overseer and a Master, Iori stopped outside the church and asked Ciel to sense what it was hiding.

• Ciel told Lord El-Melloi II she possessed Rhinegold and persuaded him to secure her a Master slot and provide Clock Tower information in exchange for money and a promise of Rhinegold if Einzbern won.
• Iori waited outside the café, fed a kitten, and confirmed that Lord El-Melloi II had agreed to help Ciel.
• Ciel questioned Iori about his knowledge, and he claimed his Measurement Type Future Sight showed changing possibilities rather than certain outcomes.
• Iori warned Ciel not to rely on the other Masters and asked who was overseeing the Holy Grail War.
• Ciel and Iori traveled to the church where Shirou Kotomine served as overseer and a Red faction Master, but Iori stopped outside and asked Ciel to sense what the church was hiding.

Iori and Ciel approached the church, where Rider attacked Shirou Kotomine and his Assassin, Empress Semiramis, while Vlad III’s plans and Shirou’s control over Red Faction Masters were revealed. Iori seized the distraction to head for the graveyard, and he recognized the Black Faction’s arriving Rider as Artoria Pendragon.

• Iori abandoned his plan to ambush Shirou Kotomine after discovering the church graveyard was protected by a powerful barrier.
• A Rider attacked the church, and Iori took Ciel toward the graveyard to search for items Shirou had supposedly stored there.
• Vlad III revealed that he controlled Darnic, had strengthened Yggdmillennia’s Servants, and sent Rider to ambush Shirou.
• Shirou and Empress Semiramis prepared to recall a Servant using a Command Spell as Rider battered the church’s barrier.
• Iori recognized the Black Faction’s Rider as Artoria Pendragon, the King of Britain.

Iori and Ciel disrupted the battle at the chapel while Black Spear Mordred clashed with Karna, then raided Shirou Amakusa’s graveyard collection and fled into the forest. An unknown Archer pursued them with precise arrows, but Iori used spatial displacement to escape the attack and left their next move unresolved.

• Iori reconsidered his plan to keep the Red and Black Factions balanced when Karna arrived and fought Black Artoria.
• Semiramis discovered an intruder in her gardens, and Shirou Amakusa urged her to stay at the chapel and summoned Archer back with a Command Spell.
• Iori and Ciel stole and destroyed ancient relics from Shirou Amakusa’s graveyard before escaping into the forest with a bundle of loot.
• An Archer pursued Iori and Ciel with repeated mana arrows, but Iori evaded the shots while carrying Ciel.
• Iori used spatial displacement to escape the arrows, leaving Ciel to realize they had been transported to a denser part of the forest.

Iori and Atalanta fought a running battle through the forest, using lightning and arrows while each tried to gain the advantage. Atalanta kept Iori at a distance and began preparing a decisive counterattack, but Iori suddenly vanished from her sight.

• Iori hid Ciel inside a Kidō barrier and told her to summon him with a Command Spell if danger arose.
• Atalanta searched the forest for Iori, while he used Tracking Sparrow and Lightning Emperor Summon to locate and attack her.
• Iori and Atalanta exchanged lightning strikes and arrows as they moved closer through the forest.
• Atalanta maintained a hundred-meter gap, using her hunting skills and archery to wound Iori while evading his pursuit.
• Atalanta taunted Iori and drew her bow, but he vanished; sensing danger to her front left, she threw herself backward.

Iori led Atalanta through the forest to lure her past Ciel’s pyramid, where Rhinegold distracted the Huntress long enough for him to overpower and bind her. After defeating Atalanta, Iori received a notification recording her as “The Fastest Bride” and granting him Aesthetic of Pursuit D.

• Iori reversed the chase, using Flash Step and the trees to evade Atalanta’s arrows while leading her toward Ciel.
• Iori reached Ciel’s hiding place, and she ran out of the pyramid with a suitcase before he carried her away from Atalanta.
• Atalanta pursued Iori and Ciel, but Rhinegold inside the open pyramid caught her attention and briefly disrupted her focus.
• Iori struck Atalanta, slammed her into the ground, and bound her with Nine Stars Binding before she could release her Noble Phantasm.
• Iori examined Rhinegold and learned Atalanta’s identity, then received a notification recording her as “The Fastest Bride” and awarding him Aesthetic of Pursuit D.

Iori defeated Atalanta, revealed that they belonged to the same faction, and warned her that Shirou Kotomine was controlling her Master. He spared her and asked her to remember his help, leaving Atalanta to investigate the truth while Iori explained how he had appealed to her ideals.

• Iori learned that the Mythological CG for Atalanta and the Golden Apple had unlocked, then refused to use his victory to force her into anything.
• Iori told Atalanta that he was Berserker of the Red Faction and that her Master had become Shirou Kotomine's puppet through Semiramis's influence.
• Iori freed Atalanta and warned her that Shirou aimed to control every Master, while Atalanta remained wary but agreed to investigate.
• Iori spared Atalanta and asked her to remember the debt if he later needed her help against the opposing faction.
• Iori warned Atalanta not to trust Shirou's promise to save humanity, claiming that Shirou had stolen the wish from Sella and the Einzberns.
• After Atalanta left in spirit form, Sella asked Iori how he had known his words would move her.

Iori explained why Shiro Tokisada Amakusa sought to save humanity and told Ciel they would pursue Heaven's Feel themselves. Meanwhile, Rider returned to Yggdmillennia's castle and told Vlad III that her operation had lost its meaning.

• Iori and Ciel returned to a hotel, where Ciel questioned him about Shiro Tokisada Amakusa and his wish to save humanity.
• Iori explained that Amakusa's ideals had gained a concrete plan through Einzbern and Heaven's Feel, but warned that his approach carried great risks.
• Iori promised to help Ciel win the Holy Grail War and urged her to use every means at her disposal.
• Rider returned to Yggdmillennia's castle amid thunder and lightning, catching a homunculus girl who had nearly been knocked away.
• Celenike rebuked the homunculus for approaching Rider, but Rider said it did not matter and ordered Celenike to lead the way.
• Rider stood before Vlad III in the council hall and declared that her operation had lost its meaning.

Vlad III and Black Rider agreed to fight together against the Red faction before settling their own rivalry over the Holy Grail. Meanwhile, Iori walked with Ciel to meet an ally and tempted her to use the Greater Holy Grail to heal her failing body and extend her life.

• Rider praised the Red Lancer’s skill, and Vlad III promised to arrange a duel for her after their enemies were defeated.
• Vlad III and Black Rider asserted their rival claims to authority but agreed to remain allies until the Red faction fell.
• Rider asked Celenike where the dining hall was so she could eat.
• Iori strolled through town with Ciel, buying snacks and teasing her about their unhurried walk to meet an ally.
• Iori recognized that Ciel’s senses and body were deteriorating, though she hid how badly her condition affected her.
• Iori suggested that Ciel change her wish and use the Greater Holy Grail to heal herself and secure a future.

Iori tried to persuade Ciel to make a personal wish in the Holy Grail War, knowing that she was the Lesser Grail and destined to die when it manifested. Their conversation revealed Ciel’s growing emotions before they met Shishiou and his Saber, a lively blond Servant arguing with a stray cat over a stolen fried fish.

• Iori explained that Ciel would sacrifice herself to manifest the Lesser Grail and open the world's hole, then urged her to pursue a personal wish.
• Ciel rejected Iori’s attempts to sway her, but his words stirred unfamiliar irritation and dissatisfaction in her.
• Ciel challenged Iori about his identity and mocked him for his appetite and lack of restraint.
• Iori shielded Ciel when a blond girl chased a stray cat through the street, and Ciel recognized the girl as a Servant.
• Shishiou arrived and greeted Iori and Ciel, while his Saber complained that the cat had stolen her fried fish.

Ciel warned Shishiou that Shiro Tokisada Amakusa might be controlling the Red Faction’s Masters, then used intelligence about an enemy Rider resembling Saber to secure his trust. That night, Iori explained to Ciel how they would rely on Amakusa against Yggdmillennia before eventually opposing him, while admitting that unexpected changes to the Servants had weakened his predictions.

• Ciel cautioned Shishiou to stay beside his Servant when meeting the priest, and Shishiou considered joining forces with her against Yggdmillennia.
• Ciel offered Shishiou intelligence about an enemy Servant, saying the Rider looked like Saber but was taller, had a striking figure, and wielded a lance.
• Mordred reacted with alarm to the description, while Shishiou worried the enemy Rider might be King Arthur.
• Iori told Ciel that they needed Amakusa’s leadership to defeat Yggdmillennia, but would have to overcome him afterward; he counted Saber and her Master as reliable allies and hoped Archer would help when needed.
• Iori admitted his Future Sight was not completely accurate and realized that changes to the Servants, including Black Spear Mordred’s appearance, had undermined his knowledge of the war.

Iori and Ciel encountered Shuten-dōji on the river, where her intoxicating charm left Ciel incapacitated. Iori revealed an ancient divine sword and attacked Shuten, who recognized him as her natural enemy.

• Iori explained that a Ruler was still missing from the war and wanted to contact her before she became an enemy.
• Ciel grew drowsy from the scent of alcohol, and Iori sensed that an enemy was nearby.
• Shuten-dōji appeared on their boat and tried to bewitch Iori and Ciel with her enchanted sake.
• Iori rescued the intoxicated Ciel from Shuten’s attack and protected her with Tōzanshō.
• Iori drew a jade-hilted sword and struck Shuten with sword pressures formed from water vapor.
• Shuten drew her own sword but was driven back, recognized Iori as her natural enemy, and faced his descending strike.

Iori fought Shuten-dōji across the river, using his sword and abilities to withstand her attacks and counter her lethal ambush. Shuten recognized his weapon as connected to the Heavenly Cloud Sword and mistook him for the legendary Takeru, while insisting he was not Susanoo-no-Mikoto.

• Shuten-dōji healed her wound and charged Iori with her sword, but he evaded her attacks and struck her with lightning, sending her into the river.
• Shuten-dōji tainted the river with poisonous alcohol and attacked Iori from behind with Hundred Blossoms Rondo, but his Nagi ability let her pass through him.
• Iori severed Shuten-dōji’s left arm when she emerged from her failed attack, then rejected her feigned plea for mercy because she had targeted his Master.
• Shuten-dōji called Iori Lord Takeru and guessed that his sword was connected to the Heavenly Cloud Sword, but she declared that he was not Susanoo-no-Mikoto.

Iori fought Shuten-dōji and Black Archer before Black Berserker joined the battle, forcing him to retreat from the riverbank. At Thousand-Tree Castle, Chiron apologized for the failed operation, and Lancer asked him to assess the fight.

• Shuten-dōji mistook Iori for Yamato Takeru, but Iori wounded her and nearly killed her before a hidden archer intervened with arrows.
• Iori blocked Black Archer's supersonic arrows and retreated toward shore after realizing his location had been exposed.
• Black Berserker attacked Iori at the riverbank, and Iori used iron pillars and Lightning Emperor Summon to strike him before escaping with Tōzanshō and Ciel.
• Chiron apologized to the gathered Masters and Servants at Thousand-Tree Castle for failing to capture or kill Iori and losing valuable combat strength.
• Lancer told Chiron that the battle had begun unexpectedly and asked him to share his assessment after reviewing the familiars' recordings.

After the battle, Iori cared for Ciel as Shuten-dōji’s alcohol left her overwhelmed by unfamiliar emotions. The next morning, the two woke after sleeping together, and they later went out to eat mapo tofu in Romania.

• Chiron warned Vlad III that the Red faction’s Berserker, Iori, was exceptionally powerful and might have concealed his true strength.
• Ciel apologized for holding Iori back and struggled with the strange emotions caused by Shuten-dōji’s alcohol.
• Iori comforted Ciel as she fell asleep against him, promising to stay by her side.
• Ciel woke in Iori’s arms, felt embarrassed and unsettled, then pretended to remain asleep and drifted off again.
• Iori woke, chose not to disturb Ciel, and went back to sleep beside her.
• Iori and Ciel later ate mapo tofu at a Japanese restaurant in Romania.

Iori explained to Ciel why Yggdmillennia was unlikely to target them immediately, then revealed that his Servant parameters had increased after his battle with Shuten-dōji. He told Ciel that his unusual Spirit Base grew stronger as he accomplished deeds, though he left the truth of his divine identity uncertain.

• Iori argued that Yggdmillennia would prioritize more dangerous opponents and defend its home territory rather than pursue him and Ciel.
• Ciel sensed that Iori had grown stronger, but insisted that Servants could not normally improve after being summoned.
• Iori explained that Holy Relics, legends, and physical bodies could alter a Servant’s strength despite the usual limits of Spirit Bases.
• Ciel sealed their conversation from outside listeners, and Iori described his Spirit Base as an exile’s that gained strength and fame through deeds in the World of the Living.
• Iori said his battle with Shuten-dōji had reinforced his Spirit Base, while suggesting that his true identity might not be a god.