Yumi is a serious and strict teacher who diligently guides her students. One day, she is caught on a student's mobile phone camera while engrossed in phone sex, plunging her into a brutal ordeal. Using the incriminating photos as blackmail, the students force her into compulsive blowjobs, rape, and gang rape, gradually reducing her to a helpless sacrifice. Again and again, the young, energetic students fill her with their semen, transforming the classroom into a scene of creampie violation.