A junker stumbles into a planetarium where a robot has been waiting for customers for thirty years, and by the time you understand what that means, you're already broken. The film builds its apocalypse not through explosions but through two characters talking in the dark, finding reasons to live when the world gave up. The music arrives exactly when you stop fighting it, and you realize the real devastation isn't the war that ended civilization, it's the quiet choice to care about someone when caring costs everything.

In a future ravaged by nuclear and biological war, a young scavenger known as a Junker picks his way through a quarantined, abandoned city. In the rooftop planetarium of a department store, he comes across a service robot who is still loyally waiting for customers to arrive. His practical instincts tell him to move on, yet he helps the robot repair the planetarium's projector, a choice that will reshape both their fates. The film adapts Key's visual novel and extends its story with material from the Hoshi no Hito light novel sequel, blending drama, fantasy and science fiction.