Natsume Mirai, a modern girl, is dragged into a secret underground space that still exists somewhere in the city. With an insolent face, she is made to behave by slapping or strangling her, and then her body's freedom is taken away with iron restraints. In a completely naked state, in a humiliating posture, her exposed anus is attacked by the executioner's thick manhood, vicious toys, and the medieval European legend's torture device, the "Pear of Anguish"... The pain of having her anus forcibly widened transforms into pleasure, completing a new anal slave. #YoroP