While her husband is away on a business trip, teacher Ayumi Shinoda receives a love letter from one of her students. After she professionally rejects his advances, the student’s obsession turns to vengeance. Enlisting the help of his friends, they occupy Ayumi's home and subject her to a relentless assault. As the days of imprisonment pass, Ayumi’s will to resist slowly fades until her physical limits are pushed to the breaking point, leading to a shocking transformation where she begins to crave the very men who captive her