A beautiful girl "Anka Suzune" who was taken into an inorganic and dark underground space. Waiting for her were countless iron restraints and a torturer with a terrifying appearance. Without being able to grasp the situation at all, the will to resist with the slaps and strangulations that are brought out one after another by the torturer is completely lost ... Before I knew it, my body was fixed with restraints and I was forced to obey absolutely. And various foreign substances and meat sticks are twisted one after another into the completely exposed buttocks. - The start of anal torture that is impossible to escape and inevitable madness.