Female Prisoner Sigma (2006)

Female Prisoner Sigma 2006 / 女囚Σ -シグマ- 2006 / Joshû Shiguma

Upon the discovery of the truth about her baby sister’s death, Ryo Kanzaki commits a crime in order to be sent to a female prison to take her vengeance. But the prison is firmly under the control of its director, Shibayama, and all prisoners are forced to become his slaves. Ryo keeps her innocence while enduring much torture, readying herself to confront Shibayama to take her vengeance.