1. Thomas and his friends are among the last survivors of a deadly disease that has killed most of the world's population. Thomas is beginning to lose his grip on reality and experience hallucinations as he struggles with being alone.
2. In a series of flashbacks and hallucinations, Thomas remembers happier times with his friends before they began dying off. He sees visions of his friends who are now dead.
3. By the end, Thomas is completely alone, experiencing visions of his long-deceased friend Tori, as he sits watching the sunset at their usual spot. He has fully lost touch with reality in his grief and insanity over being the sole survivor.