Rio Nakajima, an office lady known as "Miho," lived a quiet, modest life at work. But one day, carrying a red bag, she is lured after hours into a secret underground chamber. There, she witnesses a pitiful office worker screaming into the abyss, displayed as a brutal M-slave enduring extreme torment. The scene erupts with scatological elements—hard clipping, hot wax, whipping, defecation, coprophagia, and being drenched in feces and urine—unfolding a bizarre, hellish world ruled by madness and chaos. Within this nightmare, she faces yet another descent into degradation.