21-year-old Ayuna currently works as a waitress at an Italian restaurant in Tokyo. Even on weekdays, it's so busy that she doesn't have time to drink water during meals, enduring incredibly tough days. Yet the staff meal she eats every day is unbelievably delicious, which she says is one of the reasons she can't quit. As she openly admits, she's a total masochist—being dominated makes her even more sensitive, and her expressions of pleasure become increasingly noticeable. After giving her a special collar, the difference in her responsiveness became striking. Her reactions are so captivating that they hold viewers completely spellbound.