Arc 8The Royal Palace Intrusion
Yan Si pursued answers about the Soul King, broke into the Royal Palace, and stole Sayafushi before escaping to the Human World. As Hollow corruption spread through Soul Society and Urahara completed the Hogyoku, Hirako and Kyōraku began investigating Aizen’s report about Yan.
- Yan Si declined the Twelfth Division captaincy, helped Urahara Kisuke pursue it, and uncovered Kaname Tōsen’s Bankai for Urahara before confronting his suppressed anger and resolving to reach the Royal Palace.
- Yan Si arranged diversions for Hikifune Kirio’s promotion ceremony, and Yamamoto selected Urahara Kisuke as the new Twelfth Division captain while preparing to use the Royal Palace passage as bait.
- Yan Si rushed to the Royal Palace during Hikifune Kirio’s promotion, took Sayafushi, killed Ōetsu Nimaiya, and fought Ichibē Hyōsube before reaching the sealed Soul King and escaping to the Human World.
- Yan Si returned to Soul Society and told Kyōraku Shunsui about a hidden layer beneath Seireitei, while Yamamoto ordered a search for it and Aizen expanded his operations in Hueco Mundo.
- Aizen sent Hollows to infect Human World fetuses and gather data in Soul Society, while Yan Si and the Ninth Division fought coordinated Hollows and Yan Si captured Szayelaporro Granz.
- After more Shinigami transformed into Hollows, Yamamoto authorized captains to use Bankai freely, and Hirako Shinji asked Yan Si to investigate Aizen, though Yan Si found no evidence against him.
- Urahara Kisuke and Kurotsuchi Mayuri completed the Hogyoku experiment using Soul King and Hollow fragments, while Yan Si told Yoruichi that competing groups were shaping Soul Society’s turmoil.
- Hirako opened Aizen’s sealed report accusing Siwei Yan of involvement in unusual incidents, and Lisa rejected the accusation and persuaded Kyōraku to let her investigate Yan herself.