In our near-future world, children are solely conceived by artificial insemination. Even sex between married couples is viewed as taboo. Amane's family is irregular. Her parents copulated to create her and hope that she too will find love and have a child with the person she marries. But Amane falls in line with society's way of thinking and wants a regular 'clean' marriage. Then she hears of a place that is the subject of a social experiment. Everyone in Paradise-Eden will act as one big family. Could this be the perfect third way?