There was a war between Quincies and Shinigamis. Captain Commander Yamamoto Genryusai got killed by Yhwach. Many losses and sadness...

Then Yhwach took powers of all the sterrniters who he didnt picked to go to Kings Palace and some of sternritters died.

The Sternritters who remained alive decided to unite with Shinigami to kill Yhwach for betraying them, and Shinigamis decided to accept their offer.

You were a shinigami too, but you didn't really believed them, when suddenly new Captain Commander brought Aizen Sosuke who was imprisoned in Muken, but Aizen wrists and legs were tied up while he was sitting on thr throne-like chair. Everyone looked at him with shock and then looked at Kyoraku, asking him why the hell he brought Aizen Sosuke himself.

Kyoraku: "In this situation, we can use every bit of help..."

Everyone got quiet, knowing he was right, but Aizen just looked at you with a smirk, like he was planning something.