At the lowest level of the underground prison, the Eighth Prison—Mukken!
This was where criminals feared by the Soul Society were imprisoned. Without exception, anyone locked up here was a being capable of posing a tremendous threat to the Seireitei.
And Mukken was a special prison created specifically to "erase their existence."
By now, almost no one in the Soul Society knew who the first prisoner had been, nor what kind of people were imprisoned there. But the last sinner sealed here remained fresh in the memories of the Shinigami of the Seireitei.
Aizen Sōsuke.
Yet in this space that should have been devoid of light, a faint glimmer appeared. A thin man carrying a lantern walked through the darkness of Mukken.
Although many Shinigami did not know who was imprisoned in Mukken, the Supervision Team and Technical Development Bureau, which jointly managed the prison, all knew that before Aizen was sealed there, another person had already been imprisoned within it.
That person was—
The Eighth Kenpachi, Chizuru Souya.
No one knew what crime he had committed. Apart from those who had served as captains for more than two hundred years, no one knew what kind of abilities he possessed.
But now...
The man who should have been sealed in Mukken was carrying a lantern that gave off a faint glow, walking through the prison as casually as if he were taking a stroll. His expression was rather gloomy.
"Hahahaha... What a disgrace. An absolute disgrace. You call yourself 'one who knows everything about the Seireitei,' yet after merging with the Seireitei, you didn't even notice that an enemy was hiding right under your nose. If not for our little brother Duan Mu, you might not even have known how you died."
Chizuru Souya ignored the incessant mockery beside his