Devoted to justice and dedicated to their teaching duties, sisters Sayoko, a committed schoolteacher, and her younger sister Yuka, a student teacher, are admired throughout the academy for their beauty and kindness, beloved by countless male students. Against this beloved pair, a calculated conspiracy to enslave them begins to unfold. The mastermind behind it all is Kiyomi, the school nurse, who plots to claim Sayoko's boyfriend—Hiroshi Goshima, the academy's top genius—for herself. Her scheme soon spirals into ever-widening waves of humiliation, rape, and sexual slavery.