mirai natsume, a modern young woman, is dragged into a secret underground space somewhere in tokyo. her sassy face earns her slaps and strangulation to make her obedient, then her body is restrained with iron shackles. naked and exposed in a humiliating position, her asshole is assaulted by the executioner's thick cock, cruel toys, and the medieval european torture device, the pear of anguish. the pain of her forcibly stretched asshole turns into pleasure, creating a new anal slave.