Gin Ichimaru vs. Sōsuke Aizen

Gin Ichimaru vs. Sōsuke Aizen is a battle that takes place after Aizen fended off the attacks of Isshin Kurosaki, Kisuke Urahara & Yoruichi Shihōin and arrives with Gin at the real Karakura Town in Soul Society to create the Ōken. It is Gin Ichimaru's betrayal of Aizen and the culmination of his preparation efforts over 100 years in an attempt to eliminate Aizen.

Aftermath
Aizen throws Gin into a nearby building. Rangiku arrives unharmed and screams his name, she holds him in her arms and cries. As Gin slowly dies, he affirms to himself that he failed, as in the end, he couldn't get back what was taken from her and that he is glad he said he was sorry. Upon Ichigo's arrival Gin notices the strength in his eyes after only seeing the despair in them previously, he then takes solace in the fact that he can die and entrust the task of killing Aizen to him.