Prologue: Winter War
This was the closing of the war. One last final battle and they would win or lose. Everything was at stake. Everyone depended on this man even if they didn't know this included Earth, Soul Society and even Hueco Mundo. He was their last hope. Their last light from the heartless man before him and he was; Aizen. Aizen merged himself with the hoguyoku and discarded his zanpaktou. Both were with transcendent powers.
The difference between them; where their personalities and the orange haired one was the forgiving one of the two. The orange haired one was by all accounts a leader. From the battle both learned more from each other, Aizen's loneness, and Ichigo's will to protect others.
After clashing once more, and Aizen's continue use of pointless kido. Aizen was beaten by two intersecting diagonal slashes on his body and having the Hoguyoku leaving Aizen for the more capable strength worthy of the hoguyoku. What surprised Aizen is that Ichigo pulled out an envelope and handed it to Aizen saying that it has his instructions that should be followed to the letter. Once he had the letter was in his hand a shock wave that would have leveled the nearby hills if it wasn't for Aizen's reiatsu protecting him and the nearby area. Draining Aizen of his left over power, and then the hybrid shinigami left not trace. Except the envelope which is a bunch of orders for a man who wanted to be the Soul King.
Powerless to do anything Aizen saw some familiar shinigami headed his way and they were captains and vice-captains. Aizen was reduce to crawl away since the removal of the hoguyoku; his only source of power since he destroyed his zanpaktou. Crawling to a stump only to be block off by Rukia who at the moment wasn't very patient with the Soul King challenger.
Aizen tried and sentenced 10,000 years without soul reaper powers and nestled in the deep part of the maggots nest. Once placed inside the room he read the contents of the envelope. The content of the first page is what surprise Aizen the most.
About a week after Ichigo disappeared, Ichigo is declared MIA. In that week, the vizored went back into hiding from soul society. Ichigo's human team, Chad, Orihime, and Ishida found a spiritual development for Keigo and Tatsuki. Rukia and Renji claimed that as long as they don't betray Ichigo's friends that soul society is safe but to cut them off like they don't exist are worse than betraying Ichigo's friends and Ichigo. An order is sent to Rukia that she is to be in Karakura town until Ichigo returns back home.