Chapter Summaries

Yotsuba Mahiro began attending Saikai Academy as a transfer student, where he irritated Natsuki Minamiya before sensing a magical eruption at a convent. He arrived with Aye and Natsuki to find children in danger and recognized a silver-haired girl as strangely familiar.

• Natsuki Minamiya introduced Yotsuba Mahiro to his new class and declared that she would be his teacher and homeroom teacher.
• Mahiro teased Natsuki about her height, ignored her lesson, and deflected a piece of chalk back at her forehead.
• Mahiro sensed uncontrolled magical power erupting near the school and left class, then Aye caught up with him in the hallway.
• Mahiro used spatial movement to take Aye to a convent near Saikai Academy, where frightened children cried for help.
• Natsuki arrived and urged Mahiro to rescue the children, who were fleeing a violent crimson sphere of magical power.
• Mahiro noticed a familiar-looking silver-haired girl stay behind to help a child who had fallen.

Yotsuba Mahiro and Natsuki Minamiya confronted Sage's Blood after it attacked the convent, and Mahiro destroyed its alchemical core using Mahapadma. Natsuki refused to let Mahiro keep the immobilized Sage's Blood, though he had already analyzed it and planned to reproduce it himself.

• Yotsuba Mahiro shielded convent residents from Sage's Blood while Natsuki Minamiya and Aye identified it as a dangerous alchemical creation.
• Natsuki Minamiya tried to contain Sage's Blood with spatial magic, and Mahiro froze its spreading mass with Demon Manifestation: Ice Storm General, but it broke free.
• Mahiro analyzed Sage's Blood, located its black alchemical core, and used Mahapadma to freeze time and pierce the core with a transmuted longsword.
• The shattered core left Sage's Blood inert and solidified as a massive ruby, which Mahiro could not safely break down.
• Natsuki Minamiya refused Mahiro's request to take Sage's Blood, and Mahiro decided he could replicate it using the knowledge he had analyzed.

Yotsuba Mahiro treated the surviving children from Aldegard Convent, healing their Spirit Blood erosion despite the pain caused by Regrowth. After arranging hospital care, he recognized the silver-haired girl as Kanase Kanon and promised to visit her again, leaving her hoping he would keep his word.

• Mahiro insisted that the surviving children needed care, then soothed and treated them while Natsuki Minamiya and Aya Sengakuji watched.
• Mahiro used Regrowth to heal the children’s injuries and Spirit Blood erosion, enduring severe pain as he continued treating them.
• The silver-haired girl wiped Mahiro’s sweat and helped care for the other children while he finished their treatment.
• Mahiro and Aya accompanied the children to the Demon Sanctuary’s hospital, where Natsuki arranged their care and the children remained for observation due to underlying illnesses.
• Mahiro identified the silver-haired girl as Kanase Kanon, told her he would visit again, and heard her timidly ask whether he really would come back.

Yotsuba Mahiro reassured Kanase Kanon that he would visit again, then returned to his life on the artificial island, where his experiments with Sage’s Blood repeatedly exploded. After Aya Sengakuji suggested using the dragon vein sealed beneath the island, Mahiro postponed the idea and went to visit the children at the hospital.

• Mahiro promised Kanase Kanon he would visit her again, and Natsuki Minamiya teased him about adopting her.
• Mahiro, Aya Sengakuji, and Natsuki Minamiya returned to Natsuki’s apartment, where Yuuma greeted them and Natsuki wished she were wearing a maid outfit.
• The Artificial Island Management Corporation sealed Aldegard Convent and the Blood of the Sage, prompting Mahiro to call the decision stupid.
• Mahiro repeated a school year because of poor attendance, then spent his time visiting the children and experimenting with Sage’s Blood and his own blood.
• Mahiro’s latest experiment exploded, and Natsuki Minamiya stormed into his room before he slipped away to search for inspiration.
• Aya suggested that Mahiro use the dragon vein sealed beneath the artificial island, but he decided to visit the children at the hospital first.

Mahiro confronted Kanase Kensei, who wanted to take Kanase Kanon for his secret [Simulated Angel] research, and let Kanon decide where she wanted to live. Kanon rejected her uncle and chose to stay with her friends, so Mahiro arranged to fund an orphanage for them and left wondering when the Feast of the Flame would begin.

• Mahiro accused Kanase Kensei of seeking Kanon as a medium for his [Simulated Angel] research and threatened him if he targeted her.
• Mahiro called Kanon out, and she told Kensei she did not want to live with him because she was happy with her friends.
• Kensei left after Mahiro blocked him from approaching Kanon and warned him not to target the other children.
• Mahiro offered to fund an orphanage so Kanon and her friends could stay together, and Natsuki Minamiya agreed to the plan.
• Mahiro teased Natsuki by asking to borrow Itogami Island's dragon vein, then completed his daily mission and declined Aye's offer to dispose of Kensei.

Mahiro met Asagi Aiba at the hospital after her mother died, and their conversation lifted her spirits before she left. Back at Natsuki's apartment, Yuuma welcomed Mahiro and Aye as her parents, while Natsuki scolded Mahiro for skipping school and borrowing the Dragon Vein.

• Mahiro refused Aye's suggestion and left the hospital, where he found a tearful girl sitting in the corridor.
• Mahiro spoke with the girl, learned her mother had died that evening, and kept her company until she felt cheerful enough to leave.
• The girl introduced herself as Asagi Aiba, and Mahiro recognized her as the Electronic Empress, a major figure from the original story.
• Mahiro and Aye returned to Natsuki Minamiya's apartment, where Yuuma greeted them as her parents.
• Natsuki reprimanded Mahiro for missing school and asking to borrow the Dragon Vein, and Mahiro teased her by saying he would be happy to remain her student.

Mahiro discovered that Kojou Akatsuki, Nagisa Akatsuki, and Motoki Yaze had enrolled at Saikai Academy, raising questions about how events were following the expected course. Natsuki explained the Akatsuki siblings’ dangerous family connections, while Mahiro remained uncertain about what their arrival meant.

• Mahiro asked Yuuma about Asagi Aiba, then explained that he had comforted her after her mother died, but Natsuki mocked him when Aya left without backing him up.
• Mahiro spent the vacation lounging in Natsuki’s office with Est and Avrora, despite Natsuki’s complaints.
• Mahiro found Motoki Yaze’s transfer-student file and recognized him as an Overadapter and the Yaze family’s observer assigned to watch the Fourth Primogenitor.
• Mahiro found Kojou and Nagisa Akatsuki’s enrollment files and wondered why Kojou had come to Itogami Island after losing his connection to Avrora.
• Natsuki said she knew the Akatsuki siblings and revealed that they had arrived with their mother, Misaki Akatsuki, a research director at MAR’s Itogami Island branch.

Yotsuba Mahiro warned Natsuki Minamiya that Itogami Island was a feng shui altar designed to sacrifice its inhabitants, and she learned that the island’s purpose had been concealed from her. Natsuki then confronted Koyomi Himgari and Miwa Toyama over their demands concerning Avrora and the Feast of the Flame.

• Yotsuba Mahiro stopped Avrora from drinking his blood without permission, then comforted her and jealous Est while speaking with Natsuki Minamiya.
• Yotsuba Mahiro explained that Itogami Island’s four surrounding islands and underground Dragon Vein formed a feng shui altar that could turn the island’s living creatures into sacrifices if activated.
• Aye entered and mocked Natsuki Minamiya for having been deceived, but Natsuki left before explaining her response to Mahiro’s discovery.
• Natsuki Minamiya met Koyomi Himgari and Miwa Toyama, who asked her to make Yotsuba Mahiro return Number Twelve Flame Haze Night Emperor and withdraw from the Feast of the Flame.
• Natsuki Minamiya rejected their demands and accused the Lion King Agency of using supervision as a pretext to distribute women among factions, angering Miwa Toyama and Koyomi Himgari.

Natsuki Minamiya challenged Koyomi Himgari over the Lion King Agency’s attempt to keep Yotsuba Mahiro from the Feast of the Flame, then Mahiro returned home and was confronted by a desperate MAR researcher demanding Subject No. 12. He invited the woman inside to talk, while Natsuki and Aya were already waiting in the living room.

• Natsuki Minamiya accused Koyomi Himgari of misrepresenting Aya Sengakuji and Yotsuba Mahiro’s actions at the MAR Research Institute and warned her not to target Mahiro.
• Koyomi Himgari said she would consider Natsuki’s suggestion to send young women to monitor Mahiro, then left with Miwa Toyama.
• A disheveled woman in a lab coat clung to Mahiro in his apartment hallway and demanded that he return Subject No. 12.
• Est and Avrora pulled the woman away from Mahiro, and she recognized Avrora as Flame Haze Night Emperor No. 12.
• Mahiro brought the woman into the apartment, sent Yuuma and the two girls to another room, and prepared to hear her out.
• Natsuki Minamiya sat with Aya Sengakuji in the living room when Mahiro and the woman arrived.

Misaki Akatsuki asked Yotsuba Mahiro to save her daughter Nagisa by transferring the First Primogenitor’s soul back into Avrora, but Mahiro found the soul too deeply entangled with Nagisa to separate safely. He proposed taking Nagisa to the Feast of the Flame as a desperate chance, just as Miwa Toyama arrived and confronted Natsuki Minamiya.

• Misaki Akatsuki explained that the First Primogenitor’s soul was weakening Nagisa Akatsuki and begged Mahiro to hand over Avrora, but he refused and agreed to examine Nagisa.
• Misaki led Mahiro, Natsuki Minamiya, and Aya Sengakuji through her messy quarters to Nagisa’s clean bedroom, where Kojou Akatsuki had been keeping watch.
• Mahiro used the Gate to discover that the First Primogenitor’s soul was draining Nagisa’s life and could not be removed without destroying Nagisa’s soul.
• Mahiro told Misaki that bringing Avrora would not save Nagisa, then suggested keeping Nagisa treated until the Feast of the Flame as a desperate gamble.
• Miwa Toyama entered the room, ignored Misaki, and walked up to Natsuki Minamiya.

Yotsuba Mahiro killed Miwa Toyama after she threatened to take Avrora and invoked the Lion King Agency, escalating the conflict over Prototype No. 12. At High God Forest, the Three Saints learned that Mahiro would remain in the Feast of the Flame and planned to send him a fiancée.

• Miwa Toyama asked Natsuki Minamiya to make Mahiro surrender Prototype No. 12 so Avrora could be treated, while Aya Sengakuji mocked her.
• Mahiro attacked Miwa after she threatened Aya and insulted his woman, then crushed her neck despite Natsuki's warning.
• Mahiro dismissed the Lion King Agency's threats and said he would face the Three Saints if they came after him.
• At High God Forest, Yuantang Yuan listed four known Emperor Electors and reported that unknown entrants had stolen vessels while claiming to be Shadow Garden.
• Koyomi Himgari told the Three Saints that Miwa was dead and Mahiro would not withdraw from the Feast of the Flame.
• Koyomi advised the Three Saints to use their advantage by sending Mahiro a fiancée, suggesting the child Touka Fujisaka had brought back.

Misaki Akatsuki asked Yotsuba Mahiro to let the First Primogenitor stay close to him through Nagisa Akatsuki, and Mahiro agreed after Nagisa and Kojou Akatsuki consented. That night, the First Primogenitor revealed her plan to use the Feast of the Flame to obtain the numbered vessels and demanded Mahiro's help, leaving him facing her threat.

• Misaki Akatsuki told Yotsuba Mahiro that the First Primogenitor had awakened through Nagisa Akatsuki and wanted to stay by his side.
• Yotsuba Mahiro agreed after Nagisa Akatsuki and Kojou Akatsuki approved, and he brought Nagisa to Natsuki Minamiya's apartment.
• Nagisa Akatsuki reunited with Yuuma Sengakuji and Avrora Florestina and chatted with the girls, including Est.
• That night, the First Primogenitor entered Yotsuba Mahiro's room and admitted she wanted to use the Feast of the Flame to obtain all twelve vessels and resurrect herself.
• The First Primogenitor asked Mahiro to help her obtain the vessels in exchange for letting Nagisa Akatsuki go, and Mahiro challenged her for threatening him.

Mahiro accepted the First Primogenitor’s offer to help revive her, then comforted Nagisa after she returned to herself and realized she had kissed him. The next day, Aya attacked Yuuma at school and cut her hair; Yuuma urged Mahiro to go after her mother, who seemed to be upset.

• The First Primogenitor offered Mahiro immortality and a place beside her in exchange for helping her revive, and Mahiro agreed while hiding his hostility.
• Nagisa returned to herself after kissing Mahiro, and he reassured her that she had not acted on her own and sent her back to her room.
• At breakfast, Mahiro praised Yuuma’s changes, and he later went to school, where he fed abandoned kittens with Kanase Kanon.
• Mahiro heard that Yuuma had been attacked and rushed to her classroom, where Aya was pulling Yuuma’s hair while Asagi Aiba, Est, Avrora, and Nagisa tried to intervene.
• Aya cut Yuuma’s hair with a blade of wind, then left; Yuuma had no injuries and asked Mahiro to go after her mother because she might be sad.

Mahiro confronted Aya in the library over her jealousy of Yuuma and reassured her through an intimate encounter. The library was empty afterward, where Koyomi Himgari discovered traces of what had happened.

• Mahiro left Yuuma with Nagisa and Asagi, then headed to the library with Est and Avrora following him before he sent them back to class.
• Mahiro found Aya Sengakuji reading in the library and confronted her about being jealous of Yuuma.
• Aya admitted her fear that Yuuma might replace her, and Mahiro kissed her; they secluded the library with soundproof and spatial barriers.
• Yuuma watched the cherry blossoms from class, while Natsuki Minamiya grew inexplicably restless.
• Koyomi Himgari arrived after the barriers disappeared, found the library empty, and noticed a pale-red stain on the floor.

Yotsuba Mahiro comforted Yuuma after her conflict with Aya and later reunited with Aya in private. The chapter ended with Aya welcoming Mahiro into her bed and the two becoming intimate.

• Koyomi Himgari mistakenly concluded that Aya Sengakuji and Yotsuba Mahiro had become intimate in the library and hurried back to the Lion King Agency with her suspicions.
• Yotsuba Mahiro bought matching hairpins for Yuuma, Est, Avrora Florestina, Nagisa Akatsuki, and Kanase Kanon, and Yuuma thanked him for her first gift since regaining her memories.
• Mahiro reassured Yuuma that Aya did not hate her, and Yuuma agreed to follow his suggestion to wear her hair in a ponytail.
• Natsuki Minamiya noticed that Aya seemed softer and had greeted her after Mahiro temporarily removed Aya's bracelet, but she did not press him for details.
• After everyone went to bed, Mahiro joined Aya in her room, reassured her about Yuuma, and became intimate with her.

After Aye changed overnight and apologized to Yuuma, Mahiro and the others encountered a Progenitor-level Familiar on their way home. The newcomer recognized Avrora as her king, while another woman identified her as Veldiana and accused her of seeking a vessel at the Feast of the Flame.

• Aye apologized to Yuuma and urged her to study hard, leaving Natsuki and Mahiro puzzled by her sudden change.
• Natsuki warned Mahiro that unfamiliar demons had appeared on Itogami Island, and Mahiro suspected the Feast of the Flame was responsible.
• On the way home, Avrora asked Mahiro for ice cream, but a powerful lightning attack struck the group.
• Avrora raised a wall of ice to counter the attack, and Aye recognized the attacker as the Fourth Progenitor's Fifth Beast Vassal, Regulus Aurum.
• A woman named Veldiana arrived, recognized Avrora as her king, and was met with Avrora's frightened claim that she did not know her.
• An unidentified speaker accused Veldiana of seeking another vessel to become an Elector at the Feast of the Flame.

Balthazar Zaharias offered to buy Avrora, but Yotsuba Mahiro rejected the deal and killed him after shattering his protective barrier. Alpha, Delta, and Zeta reunited with Mahiro, while the other prototype vessels remained present.

• Balthazar Zaharias introduced Prototype No. 9, Flame Haze Night Emperor, and proposed buying Avrora from Yotsuba Mahiro.
• Mahiro agreed to sell Avrora only to reveal that he wanted Balthazar's life, then shattered the crystal barrier protecting him.
• Balthazar summoned the Familiar Mesarthim Adamas and tried to call Brote, but Alpha appeared behind him and cut him and his bodyguards apart.
• Mahiro crushed Balthazar's chest and shattered the rib he had used to transform himself into a vampire and Blood Servant.
• Alpha, Delta, and Zeta reunited with Mahiro.

Yotsuba Mahiro learned that Shadow Garden had failed to seize Base Body No. 10 after Delta lost a fight with the Chaos Empress, but he forgave them and told the gathered girls to decide whether to submit to Avrora or be devoured by her. As the Feast of the Flame drew powerful visitors to Itogami Island, Dimitrie Vattler and Iblisbel Aziz arrived and encountered a mysterious ruler.

• Gamma explained that Shadow Garden had captured Base Bodies No. 2, No. 7, and No. 8, but lost No. 10, Di Shanpo, after Delta fought the Chaos Empress and was badly injured.
• Yotsuba Mahiro told Shadow Garden not to blame themselves and said the Feast of the Flame would bring the base-body holders to the island.
• Veldiana knelt before Avrora and pledged the Karjana Clan's loyalty, while Mahiro left Avrora to answer her herself.
• Yotsuba Mahiro gave three weapon-trained girls the choice to submit to him and follow Avrora or be devoured by Avrora.
• Dimitrie Vattler and Iblisbel Aziz arrived on Itogami Island to attend the Feast of the Flame and investigate who stood behind the theft of their familiars.
• Koyomi Himgari welcomed the two vampire nobles, who then bowed to a mysterious ruler arriving on the island.

Gada, Vattler, and Iblisbel learned that Avrora had awakened and that Yotsuba Mahiro had eliminated Balthazar Zaharias by defeating powerful familiars. Mahiro arrived at the docks with Shadow Garden and, after Vattler made an unwelcome romantic advance, declared the gathered vampires guilty of violating the Sanctuary Treaty and began an execution.

• Gada questioned Koyomi Himgari, who confirmed that Avrora's early awakening had started the Feast of the Flame and that Balthazar Zaharias had already been eliminated.
• Koyomi revealed that Yotsuba Mahiro had defeated Number One and Number Five's familiars and shattered Adamantine of the Divine Ram, exciting Gada, Vattler, and Iblisbel.
• Mahiro arrived at the docks with Shadow Garden, where Gada recognized the beastman who had fought her before.
• Vattler introduced himself to Mahiro and asked for a chance to pursue him, prompting disgust from Mahiro and the others.
• Mahiro summoned Est as a silver-steel baton and declared Gada, Vattler, and Iblisbel guilty of violating the Sanctuary Treaty, then began their execution.

Yotsuba Mahiro confronted Dimitrie Vattler at the docks and defeated him after destroying his fused Familiar with a single punch. Mahiro then faced the remaining vampires as Delta attacked Iblisbel and Gada disappeared to challenge him.

• Mahiro rejected Koyomi Himgari's objections and provoked Vattler into summoning his three-headed dragon Familiar.
• Mahiro overwhelmed Vattler's attack, summoned a lightning-wreathed dump truck Familiar, and killed the dragon with one punch.
• Mahiro struck Vattler repeatedly with the Demon-Slaying Sacred Staff until he stopped moving, then asked the remaining vampires who was next.
• Delta claimed Iblisbel as her opponent and began beating him while Gada vanished and attacked Mahiro from above.