Spoiler-Safe Summary

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Aizen arrives at the site of Rukia's execution, leading to confrontations with Renji and Ichigo as they attempt to stop him. Aizen reveals his ambitions as the conflict escalates with others intervening.

Full Plot Summary

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At Unohana's command, Isane Kotetsu informs all high-ranking members of the Thirteen Court Guard Squads of Aizen's duplicity. Aizen arrives at Rukia's execution site, where Tousen has brought Rukia and Renji. When Aizen asks Renji to leave Rukia, he refuses and begins to fight Aizen. Ichigo also arrives, and the two fight in unison against Aizen. Aizen defeats both of them, and begins to explain his reasons for betraying the Soul Society until he is interrupted by Komamura.