Planetarian Chiisana Hoshi no Yume is a visual novel developed by Key set in a post-apocalyptic world. The narrative follows a man referred to as the junker who encounters a malfunctioning robot in a desolate city. Throughout the story, he remains with the robot as they explore themes of hope and humanity while striving to repair the planetarium's projector.
Planetarian: The Reverie of a Little Planet is a Japanese post-apocalyptic visual novel developed by Key and is rated for all ages. The story centers on a middle-aged man who comes across a malfunctioning robot in a dead city. The man, known simply as "the junker", stays with this robot for a time and attempts to fix the projector of the planetarium where the story takes place.