"Mugetsu!"
"AHHHHHH!" Yelled Aizen in his ultimate form.
When the dust cleared, Aizen was shown to have a cut through his head to the his lower body. But soon right after, he healed, but was weakened. While that happened, Ichigo was steadily losing power, down to the power of just a lieutenant shinigami.
Aizen got up and tried to slash Ichigo with sword, but at the last moment, Ichigo dodged. Then Aizen jumped on him while slashing and Ichigo put his blade up to block. Now with Aizen on top of him, Ichigo is trying with all of his might to fend of Aizen.
When Aizen's zanpakto is about an inch to Ichigo's head, time seemed to stop. Ichigo's mind quickly thought about all of the events leading up to this moment, how he gained soul reaper powers to protect his family, how he trained with Urahara to save
Rukia and how he bonded with his zanpakto to beat Aizen. All of his efforts has been to protect the ones he loved. He couldn't afford to lose here. Back to the outside, Aizen was wondering why Ichigo's expression turned neutral. And then it all happened.
"AHHHHHH! I WILL NOT LOSE!"
Right at that moment, time seemed to stop once again but for only a moment. Then Aizen just simply collapsed (cough cough conquerors cough haki).
Ichigo just sat there. Confused and shocked until there was a bright light, shining through for about 5 miles.
When the atmosphere returned to normal, there was a large crater shown with only one man and it's not Aizen. It was the new Ichigo Kurosaki.