Free yoga trial class for women only. Miki, who was interested in yoga, saw the advertisement and visited the class. Inside the classroom, nearly a dozen young women were preparing their bodies in various yoga poses. I was nervous since it was my first time, but I was a little relieved by the homely atmosphere. After checking in, a pair of female staff members will guide you to a room reserved for beginners. An empty room with a swing-like device. As they were told, they changed clothes and the staff made preparations. As preparations progressed, my anxiety grew. Shorts and pantyhose in thin clothing. For his safety, she was tied with a rope and a towel wrapped around his mouth. Finally, insert a rod-shaped device into her crotch. Everything was new to me, and while I was shocked, my anxiety turned into fear. Once the preparations were complete, the staff members were instructed to wait until the instructor arrived and left the room. I was alone in my room like this....