Arina is a trainee teacher at a high school. She is in charge of a class of very unruly and difficult students. She often scolds the students so they are looking for ways to get back at her. One day when she comes to school and enters the locker room, Arina discovers a masturbation device, a vibrator. It was intentionally placed in front of the locker by a student to trap her teacher. Then she picks it up and takes it to the bathroom to masturbate. Seeing that she has fallen into the trap, they secretly film her masturbating and use it to force her to have sex with them.