His Obsession

To the Soul Society, Sosuke Aizen is a treasonous man. To Kisuke Urahara, he is the cold-blooded architect behind the Hollowification experiments.
But history forgot Miyura Ren.
She was Aizen's only weakness. When she tried to stop the tragedy a century ago, the Soul Society buried her alive in the crushing black of Muken. She withered into nothingness, dying a prisoner while Aizen wore a captain's smile to hide a ravenous madness.
Standing before her empty cell, Aizen swore a terrifying vow to the dark: He would bring her back.He didn't care what laws of nature he had to break, how many lives he had to ruin, or what sins he had to commit. If the heavens refused to yield her soul, he would tear them down and build a new world from the rubble just to find her. For a hundred years, his grand treason was a violent, unstoppable crusade to fulfill that single promise.

Then came Hōgyoku.
It read the bleeding, obsessive script of its master's vow and ripped Ren's soul back from the void. But the miracle is a cruel curse.
Ren has been resurface , but not by his side. Her fragile spirit has been anchored directly into the orbit of Kurosaki Ichigo - the very boy engineered to destroy him.

Now, the monster of Las Noches watches her from the shadows. She has no memory of the Seireitei. She has no memory of his touch. She stands with the enemy, looking at him with eyes full of righteous horror.
To wage his war, Aizen must strike through the very circle shielding her. But Sosuke Aizen does not break his vows. He will drag her back into his embrace, even if he has to burn reality to ash-and murder her human host-just to claim the ghost he promised to save.