Female teacher Shino is ensnared in a gang of delinquent students' conspiracy. While trying to counsel her students, she gradually falls into their trap and is tied up in the classroom late at night, brutally raped against her will. From then on, she becomes their submissive plaything. Enduring a secretly controlled remote vibrator during exams, she is later humiliated in front of numerous classmates, tormented and sexually abused by the delinquents, torn between shame and pleasure. Even at home, she's dragged into orgies with the boys, losing all rationality as she writhes in helpless ecstasy.