Chapter Summaries

Yotsuba Mahiro traveled to a new world and found himself in a sealed prison after accidentally waking a sleeping girl with a kiss. There, a prisoner threatened him, but Ji Liule · Qilaodi stepped in to protect him.

• After spending nearly half a year in the Irregular at Magic High School world, Yotsuba Mahiro traveled through a strange field of worlds and arrived in an ancient castle.
• Mahiro found a sleeping girl in a black Gothic dress and woke her by kissing her, prompting her to bind him with chains and send him into the prison.
• The girl complained about Mahiro’s unauthorized kiss, then returned to sleep while he was taken to a deeper prison chamber.
• A bleached-blond prisoner confronted Mahiro and demanded that he show respect to his seniors, while Kiriha Kisaki warned him not to provoke the witch.
• Ji Liule · Qilaodi stepped between Mahiro and the threatening prisoner, declaring that she would protect him.

Yotsuba Mahiro recognized the prison as the barrier prison from Strike the Blood and overwhelmed the other inmates with his strength. After rejecting Gigliola Ghirardi and hypnotizing her when she tried to drink his blood, he left the surrounding convicts wondering why he had been imprisoned on Itogami Island.

• Yotsuba Mahiro recognized Kiriha Kisaki, Natsuki Minamiya, and the prison as belonging to the world of Strike the Blood.
• Yotsuba Mahiro punched and repeatedly stomped the blond vampire after the man mocked him, shaking the prison and frightening the other convicts.
• The Chain of Commandment dragged the blond vampire away before Yotsuba Mahiro could kill him.
• Gigliola Ghirardi introduced herself and repeatedly tried to get close to Yotsuba Mahiro, while Kiriha Kisaki explained that she wanted to drink his blood.
• Yotsuba Mahiro hypnotized Gigliola Ghirardi and sat at the table, where the convicts questioned why he had been imprisoned on Itogami Island.

Yotsuba Mahiro questioned fellow prisoners about Natsuki Minamiya and learned that five years remained until the story’s starting point, as well as the history between Natsuki and Aya Sengakuji. The Prison Barrier shifted into its sleeping quarters, while Mahiro decided he would stay and study the prison.

• Yotsuba Mahiro told Kiriha Kisaki that Natsuki Minamiya had imprisoned him after he kissed her, and the prisoners reacted with disbelief and admiration.
• Kiriha Kisaki explained that Aya Sengakuji had been imprisoned five years earlier after using the Dark Oath Grimoire in an attempt to erase supernatural abilities from Itogami Island.
• Aya Sengakuji described her doubts about magic and revealed that Natsuki Minamiya was bound by a witch’s contract to maintain the Prison Barrier for life.
• Yotsuba Mahiro told Aya Sengakuji he neither feared nor despised witches, then learned that Natsuki served as the prison’s warden, gate, and key.
• Yotsuba Mahiro said he was content to remain among the prisoners, and the Prison Barrier transformed the dining hall into a corridor of sleeping quarters.

Yotsuba Mahiro stayed in Kiriha Kisaki’s room and asked him about demonkind and the state of the world. Kiriha Kisaki revealed that the Fourth Progenitor’s familiars might still be available, warned Mahiro about the Lion King Agency, and left the price of his information for Mahiro to decide.

• Mahiro rejected Jiliu Le’s offer to share her room and went to stay with Kiriha Kisaki instead.
• Jiliu Le recognized Mahiro’s strength and began plotting to win him over and claim him as her partner.
• Kiriha Kisaki agreed to explain the world after telling Mahiro he suspected he came from another dimension.
• Kiriha Kisaki described demonkind, vampire ranks, and the three existing Progenitors.
• Kiriha Kisaki said the Fourth Progenitor’s twelve familiars might still be stored in separate vessels and warned Mahiro to beware the Lion King Agency.
• Mahiro asked what reward Kiriha Kisaki wanted for sharing the information, and Kiriha Kisaki told him to decide what it was worth.

Yotsuba Mahiro persuaded Aya Sengakuji to let him stay in her room while he prepared a gentle way to escape the prison. Kiiraku abandoned her attempt to sneak into the room, and Aya reluctantly shared her bed with Mahiro under a strict boundary.

• Mahiro spent the night analyzing the prison barrier and avoided Kiryuu Raku when she tried to lure him into her room.
• Mahiro slipped into Aya Sengakuji’s room and offered to help her escape in exchange for shelter for the night.
• Aya explained that her daughter, a clone named Yuuma Sengakuji, was meant to break the barrier, but Mahiro urged her to trust his plan to leave the prison the next day.
• Kiiraku approached Aya’s room intending to take Mahiro by force, then retreated when she feared Aya’s retaliation.
• Aya cut Mahiro’s half of the bed with wind blades after he sprawled on it, then ordered them to sleep on separate sides.

Yotsuba Mahiro finished analyzing the barrier prison and used teleportation to free Aya Sengakuji and Kiriha Kisaki. At LCO headquarters, Aya reunited with Yuuma Sengakuji but described her daughter as only a copy created to break the prison seal.

• Yotsuba Mahiro and Aya Sengakuji spent the night in the prison, and Mahiro finished analyzing its barrier before dawn.
• Aya Sengakuji woke Mahiro, and Kiriha Kisaki arrived to join their escape.
• Aya Sengakuji supplied coordinates for LCO headquarters, and Yotsuba Mahiro teleported her and Kiriha Kisaki out of the prison.
• Aya Sengakuji reunited with Yuuma Sengakuji and told Mahiro that Yuuma was merely a copy made to break the prison seal.
• Kiriha Kisaki thanked Yotsuba Mahiro and announced that he would leave.

Aya Sengakuji reclaimed her Witch’s Guardian from Yuuma, leaving the girl badly injured, and Mahiro confronted Aya over treating her daughter as a disposable doll. Mahiro claimed Yuuma as his own and, after Aya objected, grabbed her to test whether he could do anything to her.

• Kiriha Kisaki left after telling Mahiro he hoped he would take his earlier suggestion to heart.
• Aya Sengakuji severed Yuuma Sengakuji’s contract with the Witch’s Guardian and reclaimed the Guardian and its power.
• Mahiro treated Yuuma’s injuries and condemned Aya for discarding her daughter, arguing that Yuuma was a living person rather than a doll.
• Mahiro told Aya he would take Yuuma in, and Yuuma clung to him as she asked whether he would be her father.
• Aya refused to let Mahiro take Yuuma, so Mahiro seized Aya and challenged her claim that he could not harm her.

Yotsuba Mahiro defeated Aya Sengakuji’s resistance and secured her permission to take Yuuma Sengakuji as his daughter. After Aya left, Yuuma accepted Mahiro as her father and met Est, who introduced herself as his sword.

• Aya Sengakuji summoned her guardian knight, but Est shattered its sword while a silver-haired girl pinned it to the floor, and Mahiro continued spanking Aya until she stopped resisting.
• Mahiro asked whether Aya would let him become Yuuma’s father, and Aya said he could take the doll because it was no longer useful to her.
• Mahiro asked Aya to investigate the current situation of the Fourth Primogenitor, and she left without answering.
• Yuuma woke in Mahiro’s arms, learned Aya had left, and eagerly accepted him as her new father and guardian.
• Est showed jealousy when Yuuma called Mahiro Father, introduced herself as his sword, and happily accepted Yuuma calling her Big Sister Est.

Mahiro comforted Yuma after she revealed that Aya had raised her to be a tool, and helped her set goals for her new life. After strengthening Yuma with Diablos-enhanced serum, Mahiro received Aya's documents about the Fourth Progenitor and learned it was a sealed weapon project said to be the world's strongest vampire.

• Yuma told Mahiro that she had been born to help Aya escape prison and feared she had no value now that Aya had abandoned her.
• Mahiro encouraged Yuma to choose her own goals, and she resolved to become his good daughter, Est's little sister, and earn Aya's approval.
• Mahiro discovered that Aya secretly watched them, that they were living in a castle in a remote Japanese mountain range, and that Yuma was physically weakened after losing the Azure Knight.
• Mahiro used Diablos-enhanced serum to restore Yuma's magic power and taught her magic, which she learned well enough to cast simple spells without a CAD.
• Aya returned and gave Mahiro the information he had requested about the Fourth Progenitor.
• Mahiro learned that the Fourth Progenitor comprised twelve sealed Flame Haze Night Emperors, created as supreme god-slaying weapons and said to be the strongest vampire in the world.

Yotsuba Mahiro learned that Kojou Akatsuki had not yet become the Fourth Progenitor and agreed to join the Feast of the Flame, sending Alpha to find and seize the vessels. He traveled to Italy with Yuuma and Aya Sengakuji, where Yuuma reunited with Kojou and Nagisa Akatsuki.

• Aya Sengakuji told Yotsuba Mahiro that the Feast of the Flame would awaken the Fourth Progenitor and revealed that the Twelfth Vessel was on Gozo Island.
• Mahiro called Alpha and ordered her to use the documents to locate and take the other eleven vessels.
• Mahiro invited Yuuma to travel with him, and she excitedly agreed to leave the castle for the first time.
• Mahiro, Yuuma, and Aya arrived in Italy and encountered Jou Akatsuki, Kojou Akatsuki, Nagisa Akatsuki, and Liana at the airport.
• Yuuma called out to Kojou and Nagisa, who recognized their former playmate and greeted her.

Yotsuba Mahiro, Aya Sengakuji, and Yuuma Sengakuji reunited with Jou Akatsuki and his family in Rome before the Library located Number Twelve’s original body on Gozo Island. Mahiro and Aya approached MAR’s research facility at night to retrieve Number Twelve, but stopped when they sensed blood nearby.

• Yuuma Sengakuji introduced herself to Jou Akatsuki, while Aya Sengakuji confronted him and Liana Karjana over their wary scrutiny of Yotsuba Mahiro.
• Nagisa Akatsuki chatted eagerly with Mahiro, and Yuuma called him Father; Jou then hurried his family away from the group.
• Aya had the Library investigate MAR’s bases, and its intelligence team found Number Twelve’s original body in a medical research facility on Gozo Island.
• Mahiro, Aya, and Yuuma spent several days exploring Rome before traveling to Gozo Island.
• After Yuuma fell asleep at their hotel, Mahiro and Aya headed by magic to MAR’s facility, where they noticed unnatural silence and the smell of blood.

At the MAR Medical Research Institute, Grans Hasarov and the Black Death Emperor Faction attacked the coffin chamber after defeating Liana. Aya Sengakuji and Yotsuba Mahiro arrived, and Aya cut down the attackers, but Hasarov transformed again and prepared to unleash a devastating breath attack.

• Mahiro found bloodstains at the mortuary and went to investigate, while Hasarov’s beastmen fought Liana in the corridor.
• Hasarov revealed his Divine Beast Transformation, destroyed Liana’s familiars, and shattered her heart before heading for the coffin chamber.
• Aya Sengakuji and Mahiro appeared, and Aya shielded them from gunfire with an azure knight while her grimoire extracted the attackers’ memories and killed them.
• Hasarov recognized Aya, transformed into a beast again, and gathered magic to unleash his Sacred Beast Fierce Flame.

Yotsuba Mahiro killed Khasalov, found Avrora Florestina in the Fairy’s Coffin, and revived three victims of the attack before returning to the hotel with Aya Sengakuji. There, Natsuki Minamiya confronted Aya and told her to return to the Prison Barrier, pointing out that her prison shackles remained.

• Yotsuba Mahiro killed Khasalov with the Demon-Slaying Holy Sword and entered the coffin chamber with Aya Sengakuji.
• Yotsuba Mahiro found Avrora Florestina sealed inside the Fairy’s Coffin, sensed her wish to save those outside, and stored the coffin in his ring.
• Yotsuba Mahiro revived Liana Karjana, Kojou Akatsuki, and Nagisa Akatsuki with Regrowth.
• Yotsuba Mahiro and Aya Sengakuji returned to the hotel, where they bickered about his reasons for saving the victims and his past with Yuuma.
• Natsuki Minamiya appeared in the room and told Aya Sengakuji to return to the Prison Barrier because her shackles showed she had not truly escaped.

Natsuki Minamiya defeated Aya Sengakuji in their battle and tried to return her to the Prison Barrier, but Yotsuba Mahiro cut the Chains of Commandment and rescued Aya. Natsuki refused Mahiro’s compromise and attacked him, only for him to evade her chains and take Aya away.

• Aya Sengakuji confronted Natsuki Minamiya over the Dark Oath Grimoire and attacked her, destroying the resort hotel as Natsuki evacuated its guests.
• Natsuki’s golden Guardian Knight defeated Aya’s blue knight, leaving Aya injured and bound by the Chains of Commandment.
• Mahiro cut the chains with the Demon-Slaying Holy Sword before they could drag Aya into the Prison Barrier.
• Mahiro asked Natsuki to let him supervise Aya, but Natsuki refused and insisted that both Mahiro and Aya belonged in prison.
• Natsuki attacked with more Chains of Commandment, but Mahiro dodged them and snatched Aya away while she was still bound.

Yotsuba Mahiro persuaded Natsuki Minamiya to release Aya Sengakuji so he could help her reconcile with her daughter, Yuuma. Natsuki agreed under conditions and used paired bracelets to keep Aya within a hundred meters of Mahiro, leaving the two chained together as Aya angrily resisted.

• Yotsuba Mahiro told Natsuki Minamiya that he wanted Aya Sengakuji released so he could supervise her and help her reunite with her biological daughter, Yuuma.
• Natsuki agreed to release Aya on condition that she and Mahiro stay on Itogami Island, remain under surveillance, and wear paired bracelets.
• Natsuki removed Aya’s Chain of Commandment and let her run, but Aya’s bracelet dragged her back to Mahiro when she went beyond five hundred meters.
• Aya realized Natsuki had deceived her, and she struggled against the chains binding her to Mahiro.
• Mahiro asked how long the chains would last, then complained when Natsuki said they would loosen after half an hour.

Natsuki Minamiya brought Yotsuba Mahiro, Aya Sengakuji, and Yuuma to her residence in Itogami Island’s Demon District, where she arranged for Yuuma to attend school and the adults clashed over her future. The next morning, Natsuki took them to her office to obtain demon registration permits and introduced them to her colleague Misaki Sasaki.

• Natsuki brought Mahiro and Aya to her mansion and told them they would live there.
• Mahiro put the sleeping Yuuma to bed and asked Natsuki to arrange for her to transfer to a nearby school.
• Natsuki argued that Aya had lost control of Yuuma, then arranged for Yuuma to attend Saikai Academy, where Natsuki taught.
• Natsuki ordered Mahiro and Aya to share a room, and Mahiro tied Aya up and slept on the other side of the bed.
• The next morning, Yuuma woke in an unfamiliar room and cried until Mahiro comforted her.
• Natsuki brought Mahiro, Yuuma, and Aya to her office to obtain demon registration permits and introduced her colleague Misaki Sasaki.

Yotsuba Mahiro and Aya Sengakuji received demon registration permits, and Natsuki Minamiya revealed that Mahiro would also work as an Attack Mage. Mahiro freed Avrora Florestina from Fairy’s Coffin, unleashing a freezing magical surge before the frightened girl awakened.

• Misaki Sasaki processed demon registration permits for Mahiro, Aya, and Kiriha, then told Mahiro he was registered as an Attack Mage as well as a teacher.
• Natsuki arranged Yuuma Sengakuji’s transfer and placed Aya in a library job, extending Aya’s restraint range to one kilometer.
• Mahiro summoned Est and asked whether she could subdue the being sealed inside Fairy’s Coffin; Est answered that they had a one hundred percent chance together.
• Mahiro created a spatial barrier and shattered Fairy’s Coffin, releasing Avrora Florestina and covering the office and Saikai Academy in extreme cold.
• Natsuki sensed the surge, evacuated her class, and entered the barrier, where she saw Mahiro, Est, and the awakened Avrora.
• Avrora opened her eyes, dispelled the cold and magical fluctuations, and backed away in fear.

Yotsuba Mahiro negotiated with Natsuki Minamiya to join the Feast of the Flame in exchange for protecting Itogami Island, then explained his unusual eyes and introduced Est as his sword. Natsuki agreed to let Mahiro, Est, and Avrora remain on the island under her supervision and ordered them to register and enroll alongside Yuuma Sengakuji.

• Natsuki Minamiya confronted Yotsuba Mahiro about awakening Avrora Florestina and his plan to participate in the Feast of the Flame.
• Mahiro agreed to protect Itogami Island during the Feast, and Natsuki accepted his request while insisting he remain under her supervision.
• Natsuki questioned Mahiro's spatial magic, and he explained that his Alpha Stigma eyes could replicate and analyze supernatural abilities.
• Est introduced herself as Mahiro's Demon-Slaying Holy Sword, and her threatening aura frightened Avrora until Mahiro calmed her.
• Natsuki ordered Est and Avrora to register as demons and enroll alongside Yuuma Sengakuji.

Yotsuba Mahiro dealt with a vampire riot on Itogami Island, effortlessly destroying a rampaging Familiar and killing its summoner. After spending a week suppressing similar attacks across the island, he returned to Natsuki Minamiya’s apartment with Aya Sengakuji, whose distance from him had begun to lessen.

• Yotsuba Mahiro left the office with Est and Avrora Florestina to find Misaki Sasaki and register as demons, while Aya Sengakuji teased Natsuki Minamiya afterward.
• Natsuki Minamiya sent Mahiro to stop an Old World vampire rampaging in a warehouse district, and he trapped and destroyed the vampire’s Flame Lion Familiar.
• Mahiro crushed the vampire’s heart after the man claimed to be related to Dimitrie Vattler, while Natsuki watched the fight remotely.
• Mahiro spent the next week handling vampire riots across Itogami Island and had no time to report to school.
• After suppressing the final riot on the seventh day, Mahiro returned to Natsuki’s apartment with Aya, who had grown more accustomed to his embrace.

After a vampire disturbance and a visit from Gada Qucokan, Natsuki Minamiya warned of the coming Feast of the Flame and the First Progenitor’s possible involvement. Mahiro arrived at the academy expecting to begin work as a teacher, but realized the uniform Natsuki had given him was a student’s.

• Mahiro rested at home while Avrora Florestina and Est asked him to help them change, and Natsuki Minamiya teased him about it.
• Gada Qucokan watched Mahiro sleeping and told Natsuki that Chaos Realm vampires had come to Itogami Island after hearing Subject No. 12 was there.
• Gada revealed that Mahiro would take part in the Feast of the Flame and said Kii Juranbarada was also interested in it, then vanished before Natsuki could stop her.
• The next morning, Mahiro went to the academy with the children and Aye; Yuuma Sengakuji, Avrora, and Est headed to the middle school, while Aye went to the library.
• Natsuki brought Mahiro to First Year, Class A, where he saw students wearing the same uniform and realized she had dressed him as a student.