Bleach: I Examined Aizen's Body, but There Was No One on the Table

[Bleach fan fiction + No System + Soul Society mystery + Outsmarting Aizen + Ensemble cast of canon characters + No overpowered protagonist]

Sōsuke Aizen was dead.

His body had been nailed to the high wall of the Fifth Division, where the entire Seireitei could see it.

Yet Kurose Kei, the Fourth Division's coroner, stood before an empty stone slab and heard Retsu Unohana ask him:

"Where is the fatal wound?"

Everyone was waiting for his answer.

But there was no body in front of him.

Only then did Kurose Kei remember that years ago, when Aizen demonstrated his Zanpakuto's Shikai, Kei had missed it while dealing with a rotting Hollow.

That night, he was forced to write an autopsy report addressed to thin air.

But the door to the morgue opened behind him.

Aizen, who was supposed to be dead, adjusted his glasses and smiled in the darkness.

"That's a good report."

From that day on, Kurose Kei had to deceive three people at once.

Deceive Aizen into believing he had been hypnotized.

Deceive Soul Society into believing Aizen really was dead.

And deceive himself, pretending that every silence wasn't trading someone else's life for his own.