Yui Hatano is a beautiful and highly respected female teacher, beloved by her students for her clear and attentive teaching style. She had earned widespread admiration for her dedication and professionalism. But one day, her life takes a drastic turn. At her school, she is forced to become the personal pet of one of her students. No matter where she is—inside the classroom or in front of others—his demands grow increasingly extreme. Stripped of her dignity and pride as an educator, she is plunged into a relentless cycle of pleasure and torment, enduring days of humiliation and overwhelming sensation.