As everyone knew, excessive pride and arrogance had always been a common flaw among villainous bosses in anime, and Sosuke Aizen was no exception.
This was evident from the fact that even though he knew Gin Ichimaru was an undercover agent who had been desperately searching for an opportunity to kill him, he was still willing to keep him by his side.
Because, in his eyes, it was quite an interesting thing.
By the same logic, Aizen had also seen through Allen. Unlike Kaname Tosen, Allen was not genuinely interested in his plan. He merely had an indifferent attitude and might very well betray him at some special moment in the future.
But Aizen did not care!
He had even taken the initiative to teach Allen how to train from Shikai to Bankai.
Thus, for a long time after returning to the Soul Society, Allen followed Aizen like a shadow. Under the alias Yuto Imai, he openly became the 3rd Seat of the 5th Division.
With Kyoka Suigetsu's incredible Complete Hypnosis, this man toyed with the Gotei 13 of the entire Seireitei, as well as the nobles of the Central 46 Chambers, as though they were fools in the palm of his hand.
Having witnessed all of this firsthand, Allen finally understood where Aizen's utterly abnormal arrogance and confidence came from.
Anyone who lived in such a state for centuries would inevitably come to view everything around them as dolls and chess pieces, believing themselves to be the god qualified to surpass everything and change everything.
But unfortunately, Aizen clearly did not know that Allen was not from this world and possessed a great deal of knowledge and power beyond it.
By replacing life energy with Reishi to create a soul-version Eternal Mangekyo Sharingan, Allen successfully neutralized the effects Kyoka