Yumi, a busty and alluring dark-haired woman, finds herself in a series of unfortunate events. After a bitter breakup with her fiancé, she becomes a victim of sexual harassment by the Vice-Principal. This leads to an unexpected turn of events, as the VP and a group of insatiably horny students trap Yumi in a scintillating orgy. They demand that she becomes their secretive and submissive sex slave. With little hope left, Yumi relies on the hesitant Katsutoshi and his enthusiastic girlfriend, Keiko, to help her escape the clutches of her sexual bondage. However, the task proves to be challenging, as it seems that everyone harbors an intense desire for the captivating teacher.