Recaps

Su Yang awakened the God-Tier Sign-In System, gained the Ten Great Incarnations, and became involved in conflicts surrounding Ophis, Koneko, and Serafall. After Rias asked him to become her devil Servant, Su Yang accepted, prompting Sona to confront her.

• Su Yang activated his God-Tier Sign-In System and used a panda plush to meet Ophis, earning the Ten Avatars of Vishnu and agreeing to help her reclaim Original Peace.
• Su Yang tested his new powers, met Koneko through a gaming commission, and faced Heige when she tried to take her sister away.
• Su Yang fought Heige and the Monkey King, while Serafall and Sona intervened before the pair escaped.
• Sona gave Su Yang Ajuka's Crystal Ball, and Serafall offered to make him Sona's devil Servant, but Su Yang refused to become a devil.
• Serafall secretly tried to reincarnate Su Yang with Devil Chess Pieces, but the ritual failed, and Esther revealed herself as the holy sword he had drawn.
• Su Yang learned about Koneko's past and accompanied her to the Occult Research Club, where Rias asked him to become her Servant to resist marrying Raiser Phoenix.
• Su Yang accepted Rias's offer and received the God's Familiar Chess Piece, then Sona arrived and confronted Rias over recruiting him.

Su Yang became the shared Servant of Rias and Sona, proved his strength in a match against their teams, and gained new powers while helping Koneko face her conflict with Heige. He then dealt with Amano Yuma and Jeanne before finding Issei dead, reincarnating him as a Devil, and sending Amano Yuma after Mithril.

• Su Yang revealed that he had already become Sona’s Servant, then joined Rias as a shared Servant after Sona agreed to lend the pieces needed for his reincarnation.
• Ajuka made Su Yang his student after seeing his exceptional talent, while Su Yang presented Ajuka with a more efficient Magic Circle.
• Su Yang challenged Rias and Sona’s Servants to a match, defeated their fighters, and survived Akeno and Tsubaki’s combined attack while healing Sona.
• Su Yang gained evolved Copycat Eyes and explained his inherited powers, then asked Koneko to speak honestly with Heige when they met again.
• Su Yang met Amano Yuma in Issei’s place, went shopping with her, and encountered Jeanne, whom he convinced that he was Rama’s heir.
• Su Yang transported Amano Yuma to the Dimensional Rift, used Reincarnation Holy Light on her, and brought her back to his villa as his maid.
• Su Yang found Issei dead, forced Ddraig back into him, and reincarnated him as a Devil with a Divine Soldier Chess Piece.
• While Issei remained unconscious after reincarnation, Su Yang ordered Amano Yuma to capture Mithril and bring the Fallen Angel back.

Su Yang revealed enough of his avatar power to impress Ajuka and Tanning, then drew Aisha and Ophis into his household while strengthening his ties to Jeanne and Sona. The arc left Aisha enrolled at Kuoh Academy as Su Yang prepared to meet the people Rias had arranged for him.

• Su Yang let Ajuka assess his power, then used Rama Incarnation: Overlimit to defeat Tanning’s resistance with the Chains of Heaven and a charged Brahmashira arrow.
• Ajuka stopped Su Yang’s attack, but the effort left Su Yang unconscious and injured his origin, while Tanning said he saw the future of the Underworld and the world in him.
• Su Yang met Aisha and Ophis, invited Aisha to stay at his home, and completed sign-ins by helping them and deceiving Jeanne into believing he had fought to reach their meeting.
• Su Yang gave Aisha a God's Familiar Chess Piece, transforming her into a ten-winged angel, and transformed Amano Yuma into a ten-winged Fallen Angel with another piece.
• Ajuka showed Sirzechs the recording of Su Yang’s battle, and they began persuading the Underworld’s demon families to support the Great Array Plan.
• Su Yang brought Aisha to the Student Council to arrange her enrollment, then gave Sona Tactical Glasses and received the Magic Eyes of the World Annulment.
• Aisha completed her transfer and started attending class, while Koneko told Su Yang that Rias had arranged his meeting for that night.

Su Yang recruited Tiamat, helped Koneko reconcile with Heige, and drew Issei and Vali toward their destined rivalry. After answering Jeanne’s call, he faced Vishnu in a battle that ended with Su Yang unleashing a world-spanning purifying flame.

• Su Yang entered the Forest of Familiars, challenged Tiamat, defeated her, and received the Fairy Corridor authority before collapsing from exhaustion.
• Su Yang rescued Koneko from Heige and brought Vali and Issei together, awakening Issei’s Balance Breaker and setting his sights on Vali.
• Su Yang fought Vali, defeated him even after Vali activated Juggernaut Drive, and encouraged Koneko and Heige to reconcile.
• Koneko chose to remain with Su Yang and Rias, kissed Su Yang, and borrowed the Cat Teaser Toy.
• Su Yang followed Jeanne’s call and found Vishnu attacking her, then entered an Exotic Space with her and prepared to fight.
• Su Yang fought Vishnu with Tiamat’s help, while Vishnu revealed ten powerful Avatars and badly injured Tiamat.
• Su Yang saved Tiamat from Vishnu’s golden arrow, sealed the space, and unleashed the Infinite-Kalki-Saver-Flame across the world.