Chapter Summaries

Red Fox used a secret art to make Shinji Matou eligible for the Holy Grail War, and Shinji summoned Rider Medusa. The next day, Rin and Rimuru investigated a deadly gas leak, where Rin’s Baji Quan drew Rimuru’s interest just as an enemy arrived.

• Red Fox explained how he had concealed Shinji Matou’s lack of magical aptitude, and Shinji’s Command Seals appeared as he summoned Rider Medusa.
• Rin Tohsaka woke to tea prepared by Rimuru, while Shirou Emiya woke and found Saber meditating in the dojo.
• Saber questioned Shirou about risking his life for her, and his answer renewed her resolve to pursue the Holy Grail.
• Rin took Rimuru to investigate a reported gas leak, suspecting that Caster was draining the residents’ life force to replenish mana.
• Rin broke into the building with a Baji Quan strike, and Rimuru recognized the martial art before sensing that a guest had arrived.

Rin Tohsaka and Rimuru dealt with a deadly barrier that was draining people’s life force, then traced its stolen mana to Ryudoji Temple. After Rin ordered Rimuru to intercept and kill Caster, they set out to confront the witch.

• Rin destroyed Dragon Tooth Warriors and a grotesque familiar with Gandr while Rimuru praised her skill.
• Rin explained that her father had planned for her to enter the Clock Tower at seventeen, and she questioned Rimuru about his familiarity with it.
• Rin and Rimuru entered a mist-filled office, where they found dozens of victims and discovered that a barrier was draining their life force.
• Rimuru dismantled the barrier’s nodes and mana supplies while Rin opened the building’s windows, allowing rescuers to reach the victims.
• On an overpass, Rin and Rimuru discussed Caster’s likely location at Ryudoji Temple and Rimuru’s preference for avoiding direct fights without Rin’s orders.
• Rin ordered Rimuru to intercept and kill Caster, and Rimuru invited her to witness the witch’s defeat.

Rin pursued Caster to stop her from harming ordinary people, but Caster escaped after spending a Command Seal, and Rin chose to return and prepare rather than risk Archer in an unknown stronghold. At the Tohsaka mansion, Lord Animusphere arrived seeking an alliance, and Rin heard that he trusted her chances more than Emiya's.

• Rin chased Archer and ordered him to pursue Caster, using gems to leap over buildings and keep up with him.
• Rimuru attacked Caster, but she used a Command Seal to teleport away; Rin decided to return home and investigate before trying again.
• Rimuru crushed the spear he had thrown and returned with Rin to the Tohsaka residence, where they found Lord Animusphere had disabled the estate's defenses to enter.
• Rin invited Lord Animusphere inside after learning the mansion's entrance system had failed and she had missed his attempts to contact her.
• Lord Animusphere asked Rin to cooperate with him in the Holy Grail War, explaining that he had chosen her because he did not believe Emiya could win.

Caster returned wounded after Archer defeated her, while Souichirou Kuzuki chose not to investigate a student’s disappearance until she recovered. Meanwhile, Rin questioned Lord Animusphere about his Holy Grail wish and the benefits of cooperating, and his remarks forced Rimuru’s identity as Archer into the open, leaving Rin demanding his True Name.

• Caster told Souichirou Kuzuki that Archer had spared her after their encounter, and he treated her wounds before standing watch.
• Souichirou learned Ayako Mitsuzuri was missing and suspected the disappearances and students’ fainting spells might involve Caster, but he decided not to investigate while she was injured.
• Rimuru learned that all the Masters had gathered and wondered who had summoned the final Rider.
• Rin asked Lord Animusphere what wish he would make with the Holy Grail and what benefits he could offer her; he said he wanted funds to pursue the Time Regression Theory and offered support to the Tohsaka Family.
• Lord Animusphere revealed that Rin had a connection with Archer, prompting Rimuru to admit he had withheld his identity to avoid affecting the war or burdening her.
• Rin demanded that Rimuru tell her Archer’s True Name.

Rimuru revealed his identity as the Tempest Monarch to Rin and explained that a pendant he had given her had helped summon him as her Servant. When Rin asked who had killed her father, Rimuru insisted Tokiomi was alive, leaving the reason for his disappearance unresolved.

• Rimuru confessed that he was Rimuru Tempest, and Rin recognized him as the Tempest Monarch who had won the previous Holy Grail War.
• Rimuru removed the Slime pendant from Rin’s neck and explained that it may have served as the relic that summoned him.
• Animusphere explained Alaya and described Rimuru’s agreement that made him travel through space-time as a Servant.
• Rin asked who had killed her father, but Rimuru said Tokiomi Tohsaka had survived the previous Holy Grail War and parted peacefully with him.
• Rin said her father had disappeared and that her mother had told her she might never see him again.

Rimuru told Rin Tohsaka that her father, Tokiomi Tohsaka, may have reached the Root and that Kirei Kotomine might have concealed the truth to make her suffer. Rin agreed to ally with Lord Animusphere and set out with Rimuru to confront Kirei, while Rimuru reassured her that entering the war for victory did not make her motives unusual.

• Rimuru questioned Rin about her Magic Crest and pendant, then explained that Kirei Kotomine had participated in the previous Holy Grail War and was now a Master.
• Rimuru said he had seen a figure enter a hole in the world and suggested Tokiomi had reached the Root, then suspected Kirei had hidden the truth to cause Rin pain.
• Rin decided to confront Kirei, and Rimuru gave her his coat before reminding her that Kirei was a dangerous opponent.
• Rin agreed to an alliance with Lord Animusphere, and Rimuru invited him to accompany them because Kirei might have multiple Servants and could threaten Rin.
• As they walked, Rin asked Rimuru why he had entered the previous war and reflected on her own motives; Rimuru told her that many participants sought victory or personal goals rather than the Grail itself.

Rin visited Kirei Kotomine with Rimuru and Animusphere to confirm the truth about her father’s death and Lancer’s attack. She declared that she would treat Kirei as an enemy in the Holy Grail War, then left with Rimuru, determined to be ready for their next encounter.

• Rimuru reassured Rin before she entered the church, while Animusphere triggered its magical barrier and examined its defenses.
• Kirei Kotomine greeted Rin and recognized Rimuru, and Rimuru learned that Kirei’s Servant was Lancer.
• Rin asked whether Kirei had ordered Lancer to attack her, and Kirei admitted he had summoned Lancer but claimed he had not named a target.
• Rin told Kirei to withdraw from the Holy Grail War and warned that she would show him no consideration if they met again as enemies.
• Kirei warned Rin not to trust Rimuru too much, but Rin took Rimuru’s wrist and left with him and Animusphere.
• Rin apologized for missing a chance to confront Kirei’s absent allies, and Rimuru assured her he believed she would be ready next time.

Rin recovered from an exhausting night and experienced a memory of Rimuru confronting Yuzuriha over the conflict between Touko and Aoko. She went to school with Rimuru and planned to meet Shirou Emiya, only to run into him there.

• Rimuru told Lord Animusphere that Rin had overdrawn her magical energy, then discussed future cooperation with him while Rin slept.
• Rin dreamed through Rimuru's memory of Yuzuriha, who wanted Touko and Aoko to decide their conflict themselves, while Rimuru insisted on intervening.
• Rin woke naked in her bed and learned Rimuru had carried her there after she fell asleep in the bath; she yelled at him and threw pillows.
• Rin agreed to let Lord Animusphere stay in exchange for lodging money, then left for school with Rimuru and planned to stop by the bank.
• Rin arrived at school and ran into Shirou Emiya, worrying that his Servant could not follow him inside in spiritron form.

Rin confronted Shirou about the attacks and missing students at school, then joined him in investigating after learning he had not recognized the danger. Rimuru’s search led them to the Archery Club, where a capture-type Reality Marble trapped him as he worried Rin might be left vulnerable.

• Rin overheard Shirou and Issei discussing anemia cases and a missing student, then decided to confront Shirou about attending school without Saber.
• Rin attacked Shirou to demonstrate that the school was not safe and demanded that he report the incidents to her as Fuyuki’s appointed administrator.
• Shirou learned that students might be victims of a Servant and rushed off to find Issei, while Rin and Rimuru followed.
• Souichirou Kuzuki intercepted an unseen presence near Issei, who collapsed under a sleep curse, and then left the area.
• Rin examined Issei at the Archery Club, and Rimuru identified the club as the enemy’s base before a Reality Marble trapped him in a world of flames.

Rimuru was trapped in Red Fox’s flame-filled Reality Marble while Rin and Shirou faced another pair of enemies outside. As Rimuru fought Red Fox, he focused on finding a way to break out and help his allies, and prepared to use the Gleaming Sword.

• Red Fox trapped Rimuru inside a flame-reinforced Reality Marble, while an invisible chain attacked Rin and Shirou outside.
• Rin used a gemstone barrier to save Shirou, and Rimuru contacted her telepathically to explain that he had been separated from them.
• Rin ordered Shirou to summon Saber, who arrived and stopped the blindfolded woman from attacking, but Rin told Saber not to pursue her.
• Another girl appeared and called Rin her sister, while Rimuru worried that the enemy Master might be Matou Sakura.
• Red Fox explained how Rimuru’s past actions had shaped his path, then challenged him to a fight as flames formed wings behind him.
• Rimuru froze the flames and clashed with Red Fox, but focused on escaping the Reality Marble to support his allies and drew the Gleaming Sword.

Rimuru escaped Red Fox’s barrier by bluffing with multiple Gleaming Swords, then rushed to Rin as Red Fox flew toward Sakura. Sakura confronted Rin over the Mage Association’s persecution of Magicians without crests, and Red Fox revealed that his nickname was Tyrant.

• Rimuru used Ea and Dan to fight Red Fox, but Red Fox’s flaming spear repeatedly broke his weapons and destroyed the Gleaming Sword.
• Rimuru projected more than a dozen Gleaming Swords and threatened to activate them together, forcing Red Fox to dispel the barrier and retreat.
• Rimuru headed toward Rin while Red Fox flew to Sakura, intending to use his Phoenix Crest’s connection to pursue Rimuru’s team in future worlds.
• Sakura accused the Mage Association and noble families of being revolting, saying criminals had saved her after the Association hunted extraordinary beings.
• Rin questioned Sakura about her disappearance and condition, and Sakura asked why Rin had summoned Archer.
• Rimuru appeared behind Rin and said his nickname in the outside world was Tyrant.

Rimuru told Rin about his role in the previous Holy Grail War and the destruction of the Matou Family, while Sakura rejected his attempt to justify his choices. After hearing the full story and recognizing the Tohsaka Family’s stake in the magecraft system, Rin resolved to remain a qualified Master and continue the war.

• Rimuru explained that he had destroyed the Fire Foxes after they wiped out the Matou Family, and Sakura challenged his claim that he would have acted differently from them.
• Rimuru questioned whether Sakura would have been saved by Red Fox if the Fire Foxes had not reached her first, but Sakura retorted that Rimuru had chosen to become the predator waiting for others.
• Red Fox withdrew with Sakura, while Rin asked Rimuru about the surviving Servant and the events surrounding the Matou Family.
• Rimuru told Rin about the Matou Family’s crimes and explained why he had opposed the Fire Foxes, citing his goals, political rivalry with Kenneth, and the Clock Tower’s interests.
• Rin acknowledged that the Tohsaka Family benefited from the magecraft system and promised Rimuru she would remain a qualified Master.

Souichirou Kuzuki attacked Shirou Emiya and Saber in the student council room, nearly defeating Saber before Rimuru intervened. Rin arrived to find both Saber and Kuzuki down as Rimuru used Tres-On.

• Rimuru told Rin Tohsaka that Red Fox and Rider threatened his plan to obtain the Holy Grail, so he needed to confront them before the war reached its final stage.
• Shirou Emiya realized Saber had fought in the previous Holy Grail War and guessed that his father had participated too, while Saber vowed to protect him.
• Souichirou Kuzuki entered the student council room and asked what had happened to Issei Ryudo before abruptly attacking Shirou and Saber.
• Souichirou Kuzuki overwhelmed Saber with a rapid assault, but Rimuru froze his arm and interrupted the attack.
• Rimuru used Tres-On, and Rin arrived to see Souichirou Kuzuki and Saber lying on the ground.

Rimuru drove Caster and Souichirou Kuzuki from the school after overwhelming them with magecraft, while Rin decided to inspect the school for further threats. Elsewhere, Red Fox failed to recruit Gilgamesh against Rimuru, and Shirou began repairing a computer with his magecraft as Rin watched in shock.

• Rimuru trapped Kuzuki and bombarded Caster with Magic Cannons, revealing that Caster had stepped in to protect Kuzuki.
• Caster used the Rune of All-Law Breaking to break Rimuru's barrier and escape with Kuzuki before the school day ended.
• Rimuru told Rin that Caster's base was at Ryudoji Temple and advised her to decide how they would respond, while prioritizing Red Fox as a potential threat.
• Red Fox told Gilgamesh that Rimuru had returned, but Gilgamesh rejected an alliance and insisted that only he could defeat Rimuru.
• Rin organized a search of the school, and Shirou began repairing a computer by using the words “Trace On,” leaving Rin stunned.

Rin discovered that Shirou had many Magic Circuits but had never been properly taught magic, and Rimuru explained that Shirou’s father had chosen parenthood over passing on the Magician’s path. Rin was left grieving the contrast between Shirou’s father and her own, while Rimuru privately blamed Tokiomi.

• Rin noticed Shirou using the basic reinforcement analysis spell and questioned his use of the phrase “Trace, on.”
• Shirou explained that the phrase was a habit he had formed to help activate his magic, then used reinforcement to diagnose a computer’s faulty motherboard.
• Rin examined Shirou and found that he had twenty-seven Magic Circuits, while Rimuru claimed to have 167, leaving Shirou convinced that his aptitude was poor.
• Rimuru explained that Shirou had never inherited a Magic Crest because his father had not wanted him to become a Magician and had chosen to act as a parent instead.
• Rin compared Shirou’s father’s choice with Tokiomi’s pursuit of magic, then silently grieved and envied Shirou.

Rimuru and Saber shared a quiet rooftop conversation about their ideals and the Holy Grail before Rin decided to move more proactively against the war. After Rin brought Rimuru to the Matou Family’s former residence to place familiars, she teased him about his connection to Shirou Emiya and his use of Emiya’s self-suggestion command.

• Saber joined Rimuru on the rooftop, where they discussed the past, their ideals, and why Rimuru did not want the Holy Grail.
• Rin found Rimuru and Saber after classes and said she wanted to take action to end the war sooner for Fuyuki City’s safety.
• Rin told Rimuru she had invited Shirou Emiya to her house that night so he could ask about magecraft and the previous Holy Grail War.
• Rin and Rimuru visited the Matou Family’s former residence, where Rin placed familiars and asked why Rimuru had used Emiya’s self-suggestion command.
• Rin teased Rimuru by suggesting that his return to the world was really connected to a future Emiya, while Rimuru realized she had brought him to a shopping street.

Rimuru and Rin investigated the former Matou district, then hosted Shirou Emiya, who sought answers about the previous Holy Grail War. After realizing Shirou’s wish made him an enemy of the Grail’s other participants and that he might sway Rin, Rimuru confronted him with unmistakable killing intent.

• Rimuru and Rin explored the redeveloped area near the former Matou grounds, and Rimuru found faint magical residue in an abandoned basement.
• Rin invited Shirou into the Tohsaka estate, where Rimuru explained that the previous war’s fire resulted from overflowing magical energy and that he had discarded the corrupted Grail.
• Rimuru watched Rin train Shirou, then claimed he would escort Shirou home while Animusphere stayed with Rin.
• Rimuru followed Shirou through the night, and Shirou stopped and called out to Archer after sensing his killing intent.
• Rimuru considered killing Shirou because their goals made them enemies and Shirou might influence Rin, while Shirou understood why Saber had warned him about Archer.

Rimuru stopped himself from killing Shirou Emiya after Rin proved she was willing to act as his Master and attack her classmate. He revealed that Shirou had attended his future classes and demonstrated that Shirou would eventually wield the Reality Marble Unlimited Blade Works.

• Rimuru confronted Shirou, but Rin arrived and attacked Shirou with Gandr and binding gems to prove her resolve as Rimuru’s Master.
• Rimuru stopped Rin before she could harm Shirou further, released him, and admitted that he now believed she was an excellent Master.
• Shirou asked why Rimuru wanted to kill him, and Rimuru explained that the reason came from Shirou’s future, when he had attended Rimuru’s classes.
• Rimuru formed Excalibur with Trace... on and revealed that Shirou’s future magecraft was Unlimited Blade Works, leaving Rin astonished by his Reality Marble.

Rimuru explained to Rin Tohsaka why future Shirou Emiya had become a Heroic Spirit and wanted his past self dead, while insisting he would keep his promise to kill him. Lord Animusphere later questioned Rimuru about his plan and his apparent contradiction in saving humanity while mocking other heroes.

• Rimuru showed Shirou Emiya the longbow from Unlimited Blade Works and explained that Shirou had mastered a Reality Marble after becoming a Heroic Spirit.
• Rimuru told Shirou that future him hated his past self and warned him to cherish the next few days, then pushed Rin Tohsaka away and admitted his Independent Action skill had let him act alone.
• Rimuru explained to Rin that Shirou’s endless efforts as an ally of justice had failed to change the world, leading future Shirou to resent his former ideals.
• Rin said she did not believe Shirou’s ideals were wrong, and Rimuru protested that she must not become an ally of justice.
• Lord Animusphere asked Rimuru about Shirou’s Command Seals and questioned why Rimuru, who had helped save Human Order, mocked others who tried to save humanity.

Rimuru and Animusphere traced a magical link from Shinji Matou’s hideout, discovering that Medusa and Sakura were involved and alerting their enemies to their location. The chapter ends with Rin witnessing a Magic Crest-covered girl confront Rimuru in his past.

• Rimuru brought Animusphere to a hidden Matou Family basement, where they found a summoning circle and photographs of Rin Tohsaka.
• Animusphere identified the hideout’s owner as Shinji Matou and traced his blood, but a fiery backlash injured him and revealed that Medusa was Shinji’s Servant and had joined Sakura.
• Rimuru burned the basement and its photographs, while Sakura and Red Fox realized their concealment had been breached and resolved to seek revenge together.
• Rin watched Rimuru walk through the muddy park in his past as mana poured into him, while a girl covered in glowing Magic Crests faced him in shock.