Gather Together! Group of the Strongest Shinigami

Aizen defeats Komamura with an extremely powerful kido spell and continues his explanation. He expresses his desire for the Orb of Distortion, an artifact that would allow him to gain hollow powers. He extracts the Orb of Distortion from Rukia, where Kisuke Urahara had hidden it. When he orders Ichimaru to kill Rukia, Byakuya saves her. The majority of the Thirteen Court Guard Squads then arrives to restrain Aizen. Aizen and his accomplices manage to escape when several hollows pull them into Hueco Mundo. Afterwards, as Byakuya recovers, he explains to Rukia that he married her sister, Hisana, and adopted Rukia into the Kuchiki clan due to Hisana's dying wish. However, he broke the clan's rules in doing so, and swore to his parents to uphold rules regardless of the circumstances from that point forward, and was torn between following the rules and allowing Rukia's execution or breaking them to save her.