An iron restraint used for torture in medieval Europe. ``Kuroki Ikumi'' has made a name for himself in this work, in which cold, hard iron bites into a woman's body and she has to endure the pain of restraint that completely ignores the structure of the human body. Her anus, deprived of her freedom, is attacked by cocks, toys, and legendary torture tools, and her pain, which is dominated by her anus, eventually changes to her pleasure.
