Whenever Yui, a teacher at a prestigious school, gets stressed out at work, she releases it by masturbating in the back of the classroom during class so no one notices. However, the pleasure of exhibitionism is getting more and more intense as she seeks further stimulation. Just then, she is caught by the school's cleaning staff secretly filming herself masturbating naked in front of a vending machine. Using this as a threat, she is forced to have sex in the staff room and is then trained as an exhibitionist slave. She is subjected to exhibitionist molestation play on the bus, gangbang sex with a huge amount of bukkake at an arcade, and even public masturbation in front of the students. This is the whole story of a female teacher who falls to the depths of despair!