Chapter Summaries

Su Yang discovered that Serafall had secretly attempted to reincarnate him as a devil with Devil Chess Pieces, but the process had failed. After learning Sona was upset with her, Serafall fled, and Su Yang took her Magic Wand as compensation before heading to school.

• Su Yang found Serafall sprawled outside his bedroom and kicked her out of her withdrawn state.
• Serafall cried that Sona would never acknowledge her as her Sister again, then ran away.
• Esther told Su Yang that Serafall had put Devil Chess Pieces into his body the previous night and admitted she had forgotten to mention it.
• Su Yang confirmed he had six Pawn pieces, one Rook, and one Bishop inside him, and concluded the devil reincarnation had failed.
• Su Yang found Serafall's pink Magic Wand, kept it as compensation, and prepared to go to school.

Su Yang accepted Issei Hyoudou’s request to meet Amano Yuma in his place, then gained a new ability from signing in at Kuoh Academy. Sona Sitri watched him with conflicted feelings as Su Yang considered another way to become her Servant.

• Issei Hyoudou asked Su Yang to go shopping with Amano Yuma in his place, and Su Yang agreed.
• Su Yang signed in at Kuoh Academy and received the Body Automatic Operation System, which let him set energy and tissue circulation routes within his body.
• Su Yang realized the new ability could improve his magic efficiency but might strain his Spiritual Power.
• Sona Sitri watched Su Yang from the Student Council and worried that offering him a Crystal Ball and asking him to become her Servant would seem coercive.
• Tsubaki Shinra observed Sona’s conflicted gaze and recognized that Sona had feelings for Su Yang.
• Su Yang decided that studying and improving his strength mattered most, then considered another way to become Sona’s Servant.

Su Yang went with Koneko to meet Rias, then asked Koneko about her past and learned how her older sister became a powerful stray devil. Koneko’s story ended with people in the Underworld wanting to dispose of her before she could follow her sister’s path.

• Kiryu Aika teased Su Yang about Koneko, and Su Yang asked her to cover for his absence from class.
• Koneko told Su Yang that Rias wanted to see him, and they headed to the old school building together.
• Su Yang apologized for touching Koneko’s tail and asked about her and her sister.
• Koneko told Su Yang that her older sister, a black cat, became a devil’s Servant, surpassed her master, killed him, and became a powerful stray devil.
• Koneko explained that people in the Underworld feared she might do the same and wanted to dispose of her in advance.

Su Yang comforted Koneko after hearing her story, then met Rias and her Occult Research Club members. Rias asked him to become her Servant so she could strengthen her position against marrying Raiser Phoenix, and Su Yang questioned whether that meant becoming a devil.

• Koneko told Su Yang about her past and worried that her sister might target Rias, so he reassured her and promised she could stay by his side.
• Su Yang and Koneko arrived at the Occult Research Club, where Rias introduced herself as its president and a devil.
• Akeno served Su Yang tea, and Yuto Kiba introduced himself; Su Yang triggered three sign-in tasks connected to Kiba's demonic sword, Holy Sword, and Holy Magic Sword.
• Rias explained that she wanted Su Yang's strength and asked him to become her Servant so she could resist marrying Raiser Phoenix.
• Su Yang asked whether becoming Rias's Servant meant becoming a devil.

Su Yang agreed to become Rias Gremory’s Servant to complete a Gold-level plot sign-in, earning a special chess piece that could turn any race into a Servant without changing their race. Sona arrived at the Occult Research Club to stop Rias from recruiting him.

• Rias explained the benefits of becoming her Servant as Su Yang triggered a Gold-level sign-in tied to accepting her request.
• Su Yang agreed to become Rias’s Servant and received the God's Familiar Chess Piece as his sign-in reward.
• Sona rushed into the Occult Research Club after learning Rias was trying to recruit Su Yang.
• Rias challenged Sona for barging into the club, while Sona confronted her over trying to take Su Yang.

Sona confronted Rias over trying to recruit Su Yang, who revealed that he had already accepted Rias’s request. He then showed that Sona’s Devil Chess Pieces were already inside him, leaving both devil girls confused about his status.

• Sona accused Rias of openly trying to take her prospective Servant, while Rias argued that Su Yang was not yet Sona’s Servant.
• Rias announced that Su Yang had agreed to become her Servant, and Sona was heartbroken when he confirmed it.
• Su Yang explained that he had thought Rias needed urgent help and revealed he had already become Sona’s Servant.
• Su Yang summoned eight Devil Chess Pieces from his hand, and Sona recognized them as six Soldiers, one Bishop, and one Knight that had vanished from her set.

Su Yang explained that Sona’s Devil Chess Pieces had given him demonic power but failed to reincarnate him, prompting Rias and Sona to argue over who could make him a Servant. They agreed to let Rias try using her pieces, but Sona insisted on setting a condition.

• Su Yang told Rias and Sona that Serafall had put Sona’s Devil Chess Pieces into his body, but the reincarnation had failed.
• Rias questioned whether Sona’s fourteen points’ worth of pieces could really have been insufficient, and Su Yang said Rias’s pieces might complete the reincarnation.
• Rias decided to make Su Yang her Servant, while Sona argued that he should already belong to her.
• Rias appealed to Sona’s wish for Su Yang to reincarnate successfully and reminded her of her own trouble with her fiancé.
• Sona agreed to let Rias use her pieces, then said she had one condition.

Rias used her remaining Devil Chess Pieces to reincarnate Su Yang, who advanced to Intermediate Devil after absorbing the eight Soldier Pieces. Serafall arrived as Rias continued with the higher-value pieces, and Sona confronted her for using her pieces without permission.

• Sona demanded the right to decide Su Yang's actions when he competed with her, and Rias agreed to the condition.
• Rias gave Su Yang eight Soldier Pieces, which let him advance to Intermediate Devil and greatly increase his power.
• Rias continued by giving Su Yang a Bishop Piece, a Monk Piece, and a Knight Piece.
• Serafall flew in to see Sona, and Sona elbowed her for using her Devil Chess Pieces to reincarnate Su Yang without permission.
• Serafall clung to Sona despite her anger.

Serafall summoned Ajuka to help resolve Su Yang’s failed reincarnation, and Ajuka made him the shared Servant of Sona Sitri and Rias Gremory. Ajuka predicted that Su Yang could reach Maou-class within a few years, leaving Rias and Sona startled by his potential.

• Serafall said she had asked Ajuka to solve Sona’s reincarnation problem.
• Ajuka appeared through a projection and greeted Su Yang, who called him Teacher Achuka.
• Ajuka offered to make Su Yang the shared Servant of Sona Sitri and Rias Gremory or give him unused Devil Chess Pieces, but Rias and Sona rejected the alternative.
• Ajuka declared Su Yang the shared Servant of Sona Sitri and Rias Gremory.
• Ajuka said Su Yang’s rapid learning suggested he could become Maou-class within a few years, astonishing Rias and Sona.

Ajuka asked Su Yang to become his only disciple, and Su Yang accepted while insisting on calling him Teacher Achuka. Su Yang gave Ajuka a small Magic Circle as a joining gift, which Ajuka accepted and teleported to his desk.

• Ajuka asked Su Yang whether he would become his only disciple, explaining that Su Yang had the potential to change the world.
• Su Yang agreed to the relationship but asked to call Ajuka his teacher instead of his master.
• Ajuka accepted Su Yang's preferred title, and the two established their teacher-student relationship.
• Su Yang used Instant Movement to retrieve a small Magic Circle and offered it to Ajuka as a gift.
• Ajuka teleported the Magic Circle to his desk, acknowledging Su Yang's gift.

Ajuka recognized Su Yang’s improved Magic Circle and accepted his human-style gesture without completing a demon apprenticeship ritual, while marveling at how quickly Su Yang learned. Ajuka canceled his deal with Sona and left to prepare advanced lessons, while Serafall hurried back to the Underworld.

• Su Yang showed Ajuka a modified Magic Circle that worked five percent more efficiently than Ajuka’s original.
• Ajuka told Su Yang to study the Crystal Ball materials and revealed that Su Yang had already completed more than a tenth of the course in a few hours.
• Sona, Rias, and Koneko reacted to Su Yang’s exceptional learning speed, with Koneko feeling both relieved and worried about his talent.
• Ajuka decided to prepare Su Yang’s lessons and leave his official duties to Serafall and Sirzechs before ending the communication.
• Serafall received Ajuka’s message and hurried back to the Underworld, while Sona reflected that Serafall’s past actions had helped keep Su Yang from joining Rias.
• Ajuka returned through a Magic Circle, voided his deal with Sona, and said he would have helped Su Yang even without her request.

Ajuka left after Sona revealed she had made a deal with him, leaving Rias and Sona to compete over Su Yang. Su Yang proposed a friendly match to prove his worth, and Akeno prepared to test him.

• Ajuka vanished before Sona could question him, and Rias asked whether Sona had made a deal with him.
• Su Yang triggered silver sign-ins requiring him to defeat Rias Gremory's Queen, Akeno Himejima, and Sona Sitri's Queen, Tsubaki Shinra, within an hour.
• Sona confirmed her deal with Ajuka, while she and Rias each asserted their claims on Su Yang.
• Su Yang reassured Sona and Rias that he would act for them when the time came.
• Su Yang proposed a friendly match, and Akeno agreed to test whether he was worthy of Rias's future.

Su Yang challenged Rias and Sona’s combined Servants to a battle, asking them to use their full strength. The group gathered in a mountain range outside Kuoh Town, where Su Yang prepared to fight using only his Spiritual Power.

• Su Yang asked Akeno and the others to attack him together, and Rias and Sona agreed to the challenge.
• Sona sent Tsubaki to gather the other Servants, and the group chose an uninhabited mountain range outside Kuoh Town for the battle.
• Su Yang asked Sona to tell him only the Servants’ Chess Piece attributes rather than explain their abilities.
• Hanae Momo admired Su Yang, while Yura Tsubasa remarked that she wished he were wilder.
• Su Yang circulated his Spiritual Power and prepared to begin the fight without using his Avatar.

Su Yang faced Rias and Sona’s peerage in a friendly match, using three Avatars and the Blade of Salvation to demonstrate his strength. The battle began with Tourbillon’s sword shattering against Su Yang’s blade.

• Rias and Sona positioned their teams five hundred meters from Su Yang and started the match.
• Su Yang activated three Avatars and summoned the Blade of Salvation, choosing it instead of Esther to avoid injuring the devils.
• Su Yang assessed the teams’ formation as their Knights, Bishops, Queens, and Rooks took their positions.
• Yuto Kiba and Tourbillon charged Su Yang while Rias and Sona wondered whether he knew swordsmanship.
• Tourbillon attacked first, and Su Yang deflected his strike with the Blade of Salvation, instantly shattering Tourbillon’s sword.

Su Yang overwhelmed Yuto Kiba and Tourbillon during the fight, using superior martial arts and physical strength to shatter their weapons and defeat them. He explained the weakness in Kiba’s magic swords, and the battle continued with Akeno warning everyone to keep Su Yang at a distance.

• Kiba threw Tourbillon a sturdy magic sword, but Su Yang shattered it along with Kiba’s sword.
• Su Yang used Heavenly Martial Arts and overwhelming speed to strike Kiba and send him flying.
• Su Yang caught Kiba’s magic sword with his fingers and shattered it, prompting Tourbillon to withdraw.
• Akeno warned everyone not to let Su Yang get close after Kiba was defeated.
• Su Yang explained the vulnerable points in Kiba’s magic swords, and Kiba accepted the lesson.

Su Yang used the Authority of Narasimha to overwhelm Sona’s Rooks and dispel Tsubaki Shinra’s magic during the match. Rias and Sona watched as Su Yang’s strength exceeded their expectations, leaving Rias questioning whether she should have joined the field.

• Su Yang received the Cat Teaser Toy after signing in at Yuto Kiba's demonic sword.
• Yura Tsubasa and Koneko challenged Su Yang together, while Tsubaki Shinra supported them with an ice-element Magic Circle.
• Su Yang advanced using Narasimha’s power to ignore defenses and erased Tsubaki Shinra’s Magic Circle with a wave.
• Rias realized Su Yang had identified the weakness in the Sitri family’s magic without studying it, while Sona admired him and wished Rias were not involved.
• Rias asked Sona whether they had made a mistake by not taking the field, as she worried their Servants might outshine them.

Su Yang calmly advanced through Sona’s team, defeating their attacks until Akeno and Tsubaki launched a reflected thunder strike to force him to dodge. He took the blast head-on, and Sona was caught in its edge.

• Su Yang rendered Koneko and Yura Tsubasa powerless and dispersed Tsubaki Shinra’s Magic Circles as he steadily advanced.
• Kusashita Reiya abandoned scouting and joined the fight, but she also failed to stop Su Yang.
• Akeno Himejima completed her chant and used Super Thunder Strike while Tsubaki Shinra summoned her Mirror of Recollection.
• The Mirror of Recollection reflected Akeno’s attack at twice its power toward Su Yang.
• Su Yang did not dodge the thunder strike, and Sona Sitri was caught in the blast as she rushed toward him.

Su Yang survived Akeno Himejima’s lightning attack, healed Sona, and won the battle after Akeno Himejima and Tsubaki Shinra conceded. His Queen’s Defeat sign-ins succeeded, though the reward for defeating Tsubaki was not shown.

• Rias hurried toward the lightning strike as Sona and Koneko Toujou feared for Su Yang.
• Su Yang emerged with minor burns and used Kurma, the World Dragon, to heal Sona.
• Sona recovered, and Akeno Himejima and Tsubaki Shinra conceded defeat.
• Su Yang completed the sign-in for defeating Akeno Himejima and received Copycat Eyes (Evolution).
• The sign-in for defeating Tsubaki Shinra succeeded.

Su Yang gained Divine Confusion and evolved his Copycat Eyes before telling Rias and the others that he had inherited the power of The Great Hero Rama. He encouraged Yuto Kiba to pursue the hidden potential of his Sacred Gear, leaving the club with a new understanding of Su Yang’s strength and Kiba’s future prospects.

• Su Yang received Divine Confusion and evolved his Copycat Eyes, gaining control over their berserk state.
• After returning to the Occult Research Club, Su Yang told Rias that he had inherited The Great Hero Rama’s power and explained the Blade of Salvation.
• Akeno Himejima and Yuto Kiba recognized the scale of Rama’s power and understood why Kiba’s sword had broken.
• Su Yang told Kiba that his Sacred Gear could develop the power to sever Holy Swords and urged him to work toward that possibility.
• Su Yang explained that Prajna Realm let him perceive the origins of things and glimpse possible futures.

Su Yang spoke with Yuto Kiba about his potential, then asked Koneko to walk with him and helped her reconsider why her sister Heige had killed their former master. Their conversation triggered a Gold Plot Sign-in with a one-month deadline to untie the sisters’ knot.

• Yuto Kiba looked at his hands and said he only wanted the power to avenge his companions.
• Su Yang left the group and asked Koneko to speak with him, with Rias’s permission.
• Su Yang asked Koneko what place she held in Heige’s heart and whether Heige would have risked making her suffer.
• A Gold Plot Sign-in appeared, tasking Su Yang with resolving the sisters’ conflict within one month.
• Koneko admitted she did not know why Heige had killed their former master despite loving her.