Cain is a military scientist, disappointed in the human race and convinced that the mankind has failed to create a world worth living in. A minority of privileged people are happy while the rest spend their lives in pain and hopeless struggle for survival. Cain decides to wipe out the entire human race by activating the weapons of mass destruction. After a while, he comes out of the shelter to find a place to die as the last man on Earth. However, he soon finds out that he's not alone, and goes to search to eliminate the other survivor.