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.