As a child, Natsuki believed she was an alien, a different species to her earthling family and classmates. She hoped a spaceship would come down and take her home. Now, she lives quietly in an asexual marriage, pretending to be normal.

But the buried horrors of Natsuki's past are pursuing her. As she flees the suburbs for the Nagano mountains and a reunion with her beloved cousin Yuu, she wonders, what will it take to escape thé earthlings ?