Recaps

Ailin strengthened his allies, defeated the attackers who stole the King's Seal, and protected Ise Nanao amid the nobles’ search for her family’s artifact. He then recognized Aizen’s growing influence and Tokinada’s experiments, leaving both threats in motion.

• Ailin trained Tenkai Shusuke, created Avalon, and later recruited Gin Ichimaru into the Eleventh Division after Gin rejected Aizen Sosuke’s offer.
• Ailin defeated Zaraki, who later became his vice-captain, and agreed to fight him in a Zanjutsu-only duel every ten years.
• Yamamoto assigned Ailin to help escort the King's Seal, and Ailin secretly sent five manifested Zanpakuto to attack the convoy and draw out his enemies.
• Roger and the other attackers stole the King's Seal, but Ailin and Kensei Muguruma defeated them and recovered it after a series of battles.
• Ailin protected Ise Nanao from the nobles seeking the Eight Mirror Sword, then promised to help her uncover her parents’ killers and train her after graduation.
• Ailin realized Aizen was using Kyoka Suigetsu to hypnotize Shinigami and trained the Eleventh Division members who had stayed away from Aizen’s lectures.
• Ailin warned Zaraki about possible danger to the Eleventh Division and invited Ikkaku Madarame and Yumichika Ayasegawa to join.
• Tokinada Tsunayashiro decided his incomplete fused body needed Quincy power and secretly placed spiritual particles into a human fetus.

Ailin trained Ginjo Kugo, strengthened his Zanpakuto, and defeated challengers while the Soul Society faced Aizen Sosuke’s Hollowfication experiments. After helping the Visored escape Central 46’s judgment, Ailin supported new captain appointments and began training Soifon.

• Ailin secured permission to train Ginjo Kugo as a Substitute Shinigami, then returned to the Seireitei and fused Golden Capital into his Zanpakuto, greatly increasing his power.
• Ailin defeated Zaraki and Souya Jōshirō, while Zaraki asked Retsu Unohana to teach him swordsmanship and Urahara Kisuke became captain of the Twelfth Division.
• Aizen Sosuke’s Hollowfication experiment transformed Hirako Shinji and the other investigators, and Aizen and Kaname Tōsen confronted them before Urahara Kisuke and Tetsusai Gantetsusai attempted to save them.
• Ailin arrested Urahara and Tetsusai under Central 46’s warrant, then found them protecting the Hollowfied group and agreed to keep their hideout secret.
• Ailin helped stabilize the Visored and control their Hollowfication training, then explained Aizen’s crimes to Shunsui Kyōraku, who chose to recommend Aizen for the Fifth Division captaincy so he could watch him.
• Gin Ichimaru passed his captain assessment and became Captain of the Third Division, and Ailin agreed to train Soifon so she could master Bankai.

Ailin trained Soifon, investigated Ginjo Kugo, and became entangled in Byakuya and Hisana’s future and the Shiba Clan’s troubles. Aizen framed Ailin for Hollowfication experiments, but Haruko’s recovery cleared him, just as a new crisis erupted in the Eleventh Division.

• Ailin trained Soifon in Shunkō until she mastered Infinite Shunkō, then restrained her in their assessment and secured her appointment as Second Division captain.
• Ukitake sent Ailin to investigate Ginjo Kugo, whose allies helped him escape after Ailin defeated him and uncovered Shukuro Tsukishima’s memory-altering ability.
• Ailin overcame Tsukishima’s interference, returned to Soul Society, and discussed Hisana’s precarious future with her and Byakuya before beginning Nanao’s training.
• Ailin urged Kaien Shiba to join the Academy, then trained Nanao in Kido and Observation while nobles plotted over the Shiba inheritance.
• Ailin interrupted Aizen, Gin, and Tōsen during a Hollowfication experiment, fought them, and faced Aizen’s accusation that he had conducted the experiments himself.
• Ailin denied Aizen’s charges and revealed that Avalon, his time-type Zanpakuto, sustained Haruko, and Unohana found no Hollowfication in her, and Yamamoto cleared Ailin.
• Ailin pressed Aizen to explain the Hollowfied Soul Reaper and warned him he was on his kill list, while the captains continued investigating the experiment.
• After Bankai erupted in the Eleventh Division, Ailin went to investigate as Umehari attacked the members and demanded help rescuing Jushiro Genpachi.

Ailin avenged the Eleventh Division, confronted Aizen, and continued his plans around Hollowfication while taking Rukia and Toshiro as disciples. The arc left Rukia training with Byakuya and Toshiro entering the Seireitei after awakening Hyōrinmaru.

• Ailin pursued Umehari into Mugen Jigoku, defeated and killed him after thirty-two bouts, then presented his head to the Eleventh Division in honor of its fallen members.
• Shunsui Kyōraku suspected Ailin had stolen the King's Seal and discussed his suspicions with Genryūsai Shigekuni Yamamoto, who ordered him to watch Ailin and Aizen Sosuke.
• Ailin confronted Aizen in the Fifth Division captain's office, trapped him in Unlimited Blade Works, and learned of his Hollowfication experiments and plans involving nearly a hundred Gillian-class Menos.
• Ailin stabilized Hisana Kuchiki and promised to take Rukia as his disciple, allowing the sisters to reunite before Hisana died in Byakuya's arms.
• Ailin gathered the Espada at Las Noches, punished Nnoitra and warned the group to strengthen its ranks ahead of a coming war, then continued forging Zanpakuto in his Inner World.
• Ailin took Rukia as his disciple, taught her Kido, and arranged for Byakuya to train her in Zanjutsu at the Kuchiki estate.
• Ailin found Toshiro Hitsugaya in the Rukon District and offered to train him after explaining that his uncontrolled spiritual pressure was harming his grandmother.
• Toshiro learned to control his spiritual pressure, awakened Hyōrinmaru and drew his Zanpakuto, then entered the Seireitei with Ailin.