Ryoko, a female teacher, falls into a trap set by delinquents after helping a bullied student, Yamada. She is tied up and gang-raped at school late at night and filmed on video. Ryoko becomes their sex slave. She is tortured with a vibrator during class, and after school she is toyed with in front of a large group of students and has semen splashed on her. She is then forced to have sex with Yamada...