A beautiful and talented schoolteacher, Yuu, lives a fulfilling life both professionally and personally. One weekend, she is spotted walking happily with a man by one of her students, sparking rumors that she might be leaving her job to get married. Then one day, while heading to class as usual and climbing the stairs toward her classroom, she witnesses a bullying incident. However, she remains unaware that she herself is the cause of the students' resentment. Driven by twisted desires and envy, the male students begin to target her, gradually assaulting her and subjecting her to a brutal gangbang. Her beauty and once-happy life become the very reasons she is dragged into a horrifying nightmare.