After the seas rise, food becomes scarce, prehistoric creatures return from extinction, and people evolve in horrifying ways. One girl is in love with a human man, but she worries what will come of him if they are together, secretly knowing her mutations may one day consume her and put him in danger.

In a future where technology has advanced to the point where humans can undergo "optimization" to rid themselves of emotions and increase their mental functions, one man decides to cling to his humanity in an effort to atone for his sins and appreciate the beauty of being human.