Rukia is kidnapped by Byakuya, and Ichigo has to go to Duelist Kingdom and fights seemingly insurmountable odds until he finally faces off with the villain himself.
Except, it turns out that Aizen was behind it the whole time! Aizen is actually working for an ancient Atlantean god monster who gives him a rock that has the ability to massively power-up a duelist with the drawback of feeding on their soul. Oh no! Ichigo fights seemingly insurmountable foes, growing stronger each time until finally he faces off against Aizen and sends Atlantis crashing back into the ocean's depths.
But then someone who was supposed to be his friend, Urahara, reveals that he's an evil spirit and fragment of the primeval darkness. They go back in time to Egypt somehow, where it turns out Ichigo is a God-King Pharaoh and the Quincy were actually the ruling elite priests who served him. Can Ichigo stop Urahara and Zorc?