[Yuri Hirose's first full-scale rape film!] Beautiful, virtuous schoolteacher Yuri Hirose is targeted for revenge after helping a student threatened by delinquent alumni. The former students devise a heinous plot to attack her. Lured to the library by the threatened student, she is ambushed by the waiting alumni who launch a brutal rape. Forced into deep throat with nude photos used as blackmail, Yuri breaks down in humiliating tears. Dressed in a swimsuit, she's turned into a plaything for sadistic abuse, screaming in vain as they repeatedly force themselves on her. In the sacred classroom, the coerced student joins in, spreading a treacherous gangbang. Her chastity destroyed, the honorable teacher is reduced to a mere sex slave.