The step-sister of the sex lover is actually the prison warden!? This revelation shocked everyone. However, in this prison, no matter the identity, all inmates are treated equally. Whoever steps inside these high walls cannot escape the fate of being strongly drained of their energy. This prison is as cruel as hell, and the inmates can only struggle in despair, hoping for a day of release. Yet, this hope seems distant, as everyone gradually loses themselves in this endless nightmare.