The year is 2836. It has been eight hundred years since The Great War. There are small groups of people scattered in isolated pockets around the world, but most are too suspicious of each other for any intimacy. If they don't stop hiding, and learn to help each other, there won't be anyone left on earth.
Liberty has grown up in this post-apocalyptic world. Her home is an airship built by her adopted father. Since his death, each day is just another day trying to survive in a hostile environment. That is until her father's dying friend asks if she'll take custody of a small, child-like robot.
The last thing Liberty needs is another responsibility. Surprisingly, once the endearing robot is aboard Airus, she discovers there is more to life than just living, and loving someone can be as easy as breathing.