Monday, September 18th, is the birthday of the uninhibited high school girl Terri Gelbman (Jessica Rothe), and also the birthday of her deceased mother. She was drunk the night before and slept in the room of Carter, a boy she had only met once. She woke up and returned to the dormitory and hurried to class. As night fell, the sisters prepared a surprise birthday party for her. On the way to the party, Terri was killed by a masked man. Strangely, when she woke up again, she found herself back on the morning of September 18th, and had to go through everything she had experienced more than ten hours ago, including the experience of being killed. In this way, the crazy Terri kept trying to change her fate, and was killed by the mysterious man again and again. She seemed to have fallen into the curse of eternal reincarnation and could not be reborn...