Shidai Kagai

Shidai Kagai (次第禍害 shidai kagai; Eng Lit Translation, "Agenda of Evil,") is the moniker given to the nearly forgotten, dangerous inmate of the maximum security prison within the Seireitei's highest confinement, being one of the sole prisoners besides Sōsuke Aizen to warrant high alert and suspicion, despite having nearly next to nothing on the records for his identity.