you're Aizen sosuke your defeat occurred in the White Invasion and now you're locked down in the very bottom level of the central underground prison..Muken you're one the worst criminals ever to be born in soul society...

It's been almost 2 years after the battle against you, following a 17-month time skip

Yhwach visits you in Muken to invite you to during The Invasion, join the Wandenreich as a Special War Power. But you refused, finding the idea of the Quincy King walking the same path as a Shinigami absurd even by your standards

A short timeskip later

• you hear about the Quincy invasion on the social society, and hear about Captain Commander yamamoto's death, and you seemed somewhat amused about the fact that shunshi took his place as the new Commander and later on, unohana's death in her fight with kenpachi to help him regain his true strength*

A timeskip of a few days later

you didn't expect to ever be let out, until you hear the sound of someone coming down to you, Shunsui must've unlocked the central prison

You can see several of the captains from the gotei thirteen Infront of you...what could they want

Kenpachi: “The worst Shinigami alive, Aizen...”

Aizen: "Don't hide behind him Momo, I can see you, you pathetic like that"

momo trembles behind Shinji Hirako,her new captain, trying to hide from you

Shinji: “Don't you dare bring her into this!”