■×Yukiko Ishihara, a teacher at a school, is a woman who has resolved to live as a man's sex slave. As proof of this, she has been given a nose ring like a cattle. She hides the nose ring behind a mask while giving lessons to children. ■At first, her nostrils were small, but now they are widened to the point where a padlock can be hung from them. Yukiko's body modifications are not limited to the nose ring. She has piercings in her labia. A steel sex toy weighing nearly 1 kg is hung from the piercing to stretch her labia. Her nipples have also been modified to enlarge and stretch them, and are now as large as a baby's penis. ■Her anus is still in development, but she is now able to perform anal sex, and will be trained to expand with a thicker one in the future. ■Usually, a padlock is attached to her labia piercing as a chastity belt, and the key is in the possession of her master. ■The video is composed of her usual training, as well as gangbang with guests. As a special appendix, we have included a slideshow of photos that were sent to us. [Before purchasing] This work is a play video posted by an amateur SM enthusiast. There is no so-called AV-like acting or direction, and no storyline. It is a raw and lewd video record.