Arc 7The Substitute in Yoshiwara
Yan Si recruited allies, explored the powers tied to his Asauchi, and helped Kūgo Ginjō establish himself as a Shinigami in the Human World. He returned to Soul Society and pushed Urahara Kisuke and Kurotsuchi Mayuri to investigate the fusion behind the Adjuchas he had fought.
- Yan Si recruited Gin Ichimaru into the Ninth Division, captured Hyorinmaru as a temporary Zanpakutō, and helped Byakuya marry Hisana and become head of the Kuchiki family.
- Yan Si accepted Kaname Tōsen’s transfer to the Third Division, then sparred with Yamamoto and watched Rangiku graduate into the Ninth Division.
- Yan Si discovered that his Asauchi contained intertwined Hollow and Quincy powers, manifested both abilities, and used Quincy power to contain the unstable Soul Jade.
- Yan Si traveled to the Human World in a Gigai, found the Shinigami Kūgo Ginjō in Yoshiwara, and told him to surrender his powers or accept Soul Society’s supervision.
- When an Adjuchas attacked Ginjō, Yan Si blocked its Cero and froze it with Hyorinmaru, while Aizen revealed that he had created the Hollow as a test subject.
- Yan Si persuaded Ginjō to protect Yoshiwara, and Shiba Kaien made him an auxiliary member of the Thirteenth Division under surveillance.
- Yan Si returned to Soul Society and challenged Urahara Kisuke and Kurotsuchi Mayuri to reproduce the Adjuchas’s fusion of Hollow and Shinigami powers.