Ohyaku is a tightrope entertainer/prostitute who as a little girl was nearly killed by her suicidal mother. Raised by a theater troupe she entertains with her incredible tightrope skills and is rented out to the highest bidder after the show. A ronin/professional thief Shin sees her during a performance and is smitten. He rescues her from a rapist bureaucrat who she was sold to for a night. Ohyaku falls for the thief but their happiness is short lived as the Shin is preparing to rob the local mint. The plan fails and Ohyaku and Shin fall into the hands of the bureaucrat who horribly tortures Ohyaku and kills Shin. She is sent to Sado Island, a miserable prison island and thrown into an all male prison. In addition, Ohyaku comes into the lustful gaze of the warden's evil lesbian wife/tattooist. Can Ohyaku survive and escape to fulfill her revenge?